Asking for help, clarification, or responding to other answers. I also removed the break keywords, since they may stop your code from finding matches in multiple strings in data. For example, the expression [x for x in lst if re.match(pattern, x)] finds all strings that match a certain query pattern as defined by you. This use of the SQL partial match returns all the names from the animal table, even the ones without any characters at all in the name column. You can check whether a string contains another string with in: Or, just for a laugh heres a one-liner: Essentially, this checks each element in the list for the search string and returns the first matching list element if found; otherwise None is returned. Strange fan/light switch wiring - what in the world am I looking at, "ERROR: column "a" does not exist" when referencing column alias. hi, thank you for your kind reply. To locate all the matches, you use findall or finditer instead. Match objects are always evaluated as True. Import the regex module with import re.Create a Regex object with the re.compile () function. (Remember to use a raw string.)Pass the string you want to search into the Regex objects search () method. This returns a Match object.Call the Match objects group () method to return a string of the actual matched text. There is a way to make is case insensitive by using: mystr.lower(). dictionary 338 Questions Now iterate through your list, for each sentence in your list, see if the sentence contains ans, if so print the sentence. (Basically Dog-people). Does Python have a ternary conditional operator? is bound to be a dupe, it's such a basic question. lemon pie. In earlier versions, you can use re.search() with ^ and $ to do the same. Find centralized, trusted content and collaborate around the technologies you use most. You can join his free email academy here. How to remove an element from a list by index. If case is not an issue, consider mapping all the words to lowercase. Using maximum length: A score of 100% is possible only when the two strings are exactly the same. To find a list of partial query matches given a string list lst, combine the membership operator with the filter() function in which you pass a lambda function that evaluates the membership operation for each element in the list like so: list(filter(lambda x: query in x, lst)). Cohort Analysis using Python: A Detailed Guide. Python By Shiny Swan on Jul 23 2020. if "blah" not in somestring: continue. Hope this helped you with your problem! All Rights Reserved. This is better than the above function as it doesnt explicitly take space to create new concatenated string. It gives an approximate match and there is no guarantee that the string can be exact, however, sometimes the string accurately Can you please update the question to show what youve tried / researched so far; and specifically where you are stuck? Python glob.glob () method returns a list of files or folders that matches the path specified in the pathname argument. I took the liberty of also adding case-insensitivity by lowercasing both the game name and the user input. The any function is then used to check if any elements of the filtered list are True, indicating that the check_str is present in any of the elements of the test_list. arrays 233 Questions python-2.7 124 Questions Note: .. . As discussed in the comments, if you'd like to handle things differently depending on how many games match the input, we can change things e.g. How do I make a flat list out of a list of lists? pandas 2231 Questions Numpy Heaviside Compute the Heaviside step function. Fuzzy string matching or searching is a process of approximating strings that match a particular pattern. Since you are new you may not know, but if your question has been answered please accept the answer that has answered your question by giving it a tick, if the link in the comments answers your question then please close the answer. WebPython: Find in list But if youre looking for how to retrieve partial matches for a list of strings, youll find the best approaches concisely explained in the answer below. Can I change which outlet on a circuit has the GFCI reset switch? This can be used as a filter for messages. If you want to test whether a word is substring of any of the list with words then you can use the following code snippet to check that: This will search if the test_word is a substring of any of the words in the list. You should use input to read a string and float to convert the string to a number. sub (' [^a-zA-Z] ', '', x) TypeError: expected string or bytes-like object ParserWarning: Falling back to the We can directly use this operator in the following way: We can also convert this into a function, for ease of use. But if you're looking for how to retrieve partial matches for a list of strings, you'll find the best approaches concisely explained in the answer The finditer function The finditer function returns an iterator yielding match objects over all non-overlapping matches for the pattern in a string. The longest common substring is the longest string contained in both strings. This function takes two arguments, namely pathname, and recursive flag. I'd say the most closely related solution would be to use next instead of any: Just like any, it stops the search as soon as it found a match, and only takes O(1) space. Use the string method endswith() for backward matching, i.e., whether a string ends with the specified string. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. datetime 150 Questions The whole problem of partial string matching consists of finding a function that gives a meaningful similarity score between two strings. orange juice Uppercase letters have smaller code points than lowercase letters. Lets take another case, where you wish to only check if the string is a part of another word on the list and return all such words where your word is a sub-string of the list item. For example, if my_list = ['f', 'foo'] and test1 = ['f', 'foo'] and test2 = ['foo', 'f'] without sorting, one of the success and the other will be faild. Method #3: Using re + search() Regular expressions can be used to perform many task in python. Iterating over dictionaries using 'for' loops. How can we cool a computer connected on top of or within a human brain? The pattern that we'd like to search for is given by the placeholder this_pattern. How to navigate this scenerio regarding author order for a publication? A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Hes author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide. In this article, we learned about how we can find a string with an input list with different approaches. WebTo query data based on partial information, you use the LIKE operator in the WHERE clause of the SELECT statement as follows: SELECT column_list FROM table_name WHERE column_1 LIKE pattern; Code language: SQL (Structured Query Language) (sql) The following examples showcase this solution: In this example, we use the dummy pattern .*query. By using our site, you A python program is needed to calculate investments. Now, you can iterate over your test with simple for loop: My guess is, you're just not matching the second condition properly e.g. Many problems of substrings have been dealt with many times. pip 117 Questions Various metacharacters (special characters) can be used for regular expression patterns, but it is also possible to simply specify a string as it is. Partial Fuzzy String Matching. Are the models of infinitesimal analysis (philosophically) circular? csv 182 Questions Check if string contains substring with find; Test list of strings for a exact match; Test list of strings against another list of values; Python string contains or like As a developer, you probably have already faced the problem of string matching. banana pie Learnings from building AI products as a PM, Handwritten text recognition: A robust python pre-rendering pipeline for online handwritten text datasets (IAM) with numpy augmentations, Dont take character ordering into account, Fruit and Fruits gives 100% score as the full word Fruit is the longest common substring and, Listen and Silent gives 1/3 , as two characters (en) out of six are common. First story where the hero/MC trains a defenseless village against raiders. If duplicates.ok is FALSE, values of table once matched are excluded from the search for subsequent matches. There are various approaches to this problem, from the ease of use to efficiency. Lets discuss various ways in which this can be performed. WebIn addition, an empty string can match nothing, not even an exact match to an empty string. If you want to search for the substring Hello in all elements of the list, we can use list comprehensions in the following format: This is equivalent to the below code, which simply has two loops and checks for the condition. You don't need a regexp to do a substring search. Bitcoin Trading Moving Averages or HODL? 000] but I would say average is still more around[45:55. Python Exercises, Practice and Solution: Write a Python program to create all possible strings by using 'a', 'e', 'i', 'o', 'u'. Use the characters exactly once. Python: Tips of the Day. Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters): This case is useful when you have predefined list of values and you want to verify the tested example is not part of the predefined list with values. regex 199 Questions WebWrite a Python program to get a single string from two given strings, separated by a space and swap the first two characters of each string. Python offers several different ways to check if a string contains a substring. By using our site, you In this article we will introduce and explain the different ways of doing string matching and provide you with python snippets, so you can convert them to your favorite language. re.fullmatch() was added in Python 3.4. ), Built-in Types - str.startswith() Python 3.9.7 documentation, Built-in Types - str.endswith() Python 3.9.7 documentation, Unicode/Character reference - Wikibooks, open books for an open world, Convert Unicode code point and character to each other (chr, ord), Sort a list, string, tuple in Python (sort, sorted), re Regular expression operations Python 3.9.7 documentation, Extract a substring from a string in Python (position, regex), Replace strings in Python (replace, translate, re.sub, re.subn), Split strings in Python (delimiter, line break, regex, etc. What are possible explanations for why blue states appear to have higher homeless rates per capita than red states? The metacharacter ^ matches the start of the string, and $ matches the end of the string. How Intuit improves security, latency, and development velocity with a Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Were bringing advertisements for technology courses to Stack Overflow, How to return a subset of a list that matches a condition. For example, [A-Z] represents any one letter of the uppercase alphabet, and + means that the previous pattern is repeated one or more times. How Could One Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice? But how can you return the element itself, instead of True or False. If each character of x is contained in y discretely, False is returned. Its usage is the same as startswith(). This method also has a similar time and space complexity as the previous method using the any() function. For example, the Jaccard distance between SILENT and LISTEN is 1 6/6 = 0. How do I clone a list so that it doesn't change unexpectedly after assignment? See the following article for details. These range from simple methods such as Jaccard distance to more complicated methods like Levenstein similarity, and this can be leveraged using regular expressions with the Python regex library for fast search in text data. But sometimes, one wishes to extend this on list of strings, and hence then requires to traverse the entire container and perform the generic algorithm. I want to suggest a solution to your problem. His passions are writing, reading, and coding. For approaches to retrieving partial matches in a numeric list, go to: How to return a subset of a list that matches a condition? While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students. But both work perfectly fine! Required fields are marked *. Depending on your use case, you can also compute the ratio using the maximum length from both strings: Here is a python implementation of this method using difflib: However what happens if I want to compare goodbye and goozbye? Well what happens here is that the difference in the lengths of strings plays a role. for-loop 131 Questions Firstly, we create function that recognizes if a word is a substring of any word in another list: Now, we can use this function to check if each word from the test list is a substring of a word on your list. I Created a Crypto Arbitrage Trading Bot With Python, How I Built a Readability and Grammar Checker App Using Streamlit, How I Use Python to Automate My Cover Letters, How I Generate Invoices For My Clients Using Python, How I used Python to Automate my Daily Routine with Desktop Notifications, Finxter aims to be your lever! In case you need some background information, feel free to check out our two tutorials and the referenced videos. It basically computes the ratio between the number of unique similar characters over the number of unique characters in both strings. In fact, OCR errors can show some recurring patterns (like the following: w (vv or v), O 0 , y v), hence by allowing some maximum number of errors or by specifying the type of errors allowed (insertion, deletion, substitution) we can find those keywords, as in the examples below. Use the in operator for partial matches, i.e., whether one string contains the other string. There are plenty of ways for measuring string similarity but we will be discussing these below: One of the simplest ones is to use the Jaccard distance. Looking to protect enchantment in Mono Black. LWC Receives error [Cannot read properties of undefined (reading 'Name')], Poisson regression with constraint on the coefficients of two variables be the same, Is this variant of Exact Path Length Problem easy or NP Complete. Find the strings that partially match the query string. Connect and share knowledge within a single location that is structured and easy to search. How to make chocolate safe for Keidran? mylist = ['super mario brothers', 'animal crossing', 'legend of zelda breath of the wild', 'kirby superstar ultra'] Can I make super mario brothers to be printed if the user inputs mario, legend of zelda You can also use re.match() and $, although it is not shown here. At first I had trouble figuring out which blue or red Is the relevant part. Method #1 : Using list comprehension List comprehension is an elegant way to perform any particular task as it increases readability in a long run. Method #2 : Using any() The any function can be used to compute the presence of the test substring in all the strings of the list and return True if its found in any. Numpy signbit Returns element-wise True where signbit is set (less than zero), numpy.trapz(): A Step-by-Step Guide to the Trapezoidal Rule. How good is this metric? A simple, direct answer: test_list = ['one', 'two','threefour'] There can also be such problem in which we require to check if argument string is a part of any of the strings coming in the input list of strings. Lets discuss certain ways to find strings with given substring in list. Method #1 : Using join() The basic approach that can be employed to perform this particular task is computing the join of all the list strings and then searching the string in the joined string. https://www.askpython.com/python/list/find-string-in-list-python The Levenshtein distance is based on the minimum number of modifications to apply to a string to match another one. this seems simple to me so i might have misread but you could just run it through a foor loop w/ an if statement; To subscribe to this RSS feed, copy and paste this URL into your RSS reader. if I add a line "else: print("entered game is not on the list") "after print(title), the code just prints entered game is not on the list regardless of what I put in the input. NumPy remainder()- Returns the element-wise remainder of the division. in and not in are also used to check the existence of elements in a list. Here, the approach in the linked question will return True using: So how can you return the element 'threes' instead? But how can you return the element itself, instead of True or False. * that simply matches words that contain the query string. SO: Python list lookup with partial match shows how to return a bool, if a list contains an element that partially matches (e.g. How to translate the names of the Proto-Indo-European gods and goddesses into Latin? You don't want to remove elements from the list you are iterating in. Source: stackoverflow.com. Avoiding alpha gaming when not alpha gaming gets PCs into trouble. scikit-learn 153 Questions Slicing in Python is a powerful feature that allows easy. You may be interested in searching keywords in a scanned document having OCR errors. Well, the longest common substring is goo so the similarity would be 3/7 which is very low given that only one character differs. In this method, the filter function is used along with a lambda function to check if the check_str is present in any of the elements of the test_list. The print deals with this, but you may want to do so differently. This task can be performed using naive method and hence can be reduced to list comprehension as well. Fruit and Fruits gives an 80% score as one error is introduced by s out of five characters for the smallest word, hence 1-(1/5) being 80%, Listen and Silent gives 33% as the minimal number of operations to make them match is 4 with two replacement needed, one insertion and one deletion, hence 1-(4/6) being 33%, Helps in understanding how many user interactions are required to modify a string to match another. One suggestion, in the examples, you introduce two colors red and blue, I would suggest you only introduce one and keep the rest of the sentence in black. I'd say the most closely related solution would be to use next instead of any : >>> next((s for s in l if s.startswith(wanted)), 'mydefault') How do I make a flat list out of a list of lists? 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But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. Thus, [A-Z]+ matches any substring that consists of one or more consecutive uppercase alphabetic characters. Use re.search() for partial, forward, and backward matching. Here is the implementation of the Jaccard distance in Python. We have eight names in the list. As we have seen there are a lot of ways to do approximate search and matching. Ooh, alternatively just use any as is but remember the last checked element: Another variation, only assign the matching element: (Might want to include something like or True if a matching s could be the empty string.). Python By Misty Macaw on Dec 8 2019. finditer_fun.py It finds all the matching substring using search() and returns result. How Intuit improves security, latency, and development velocity with a Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Were bringing advertisements for technology courses to Stack Overflow. wa "How can I tell if one string is contained in another?" When a list of strings is sorted with the list method sort() or the built-in function sorted(), the order is also determined based on Unicode code points. \d represents a number and {n} represents n repetitions. Recommended Tutorial: List Comprehension in Python, Recommended Tutorial: The Membership Operator in Python. One can immediately think of a similarity measure as the ratio between the length of the longest common substring and the minimal length of both strings. You don't want to remove elements from the list you are iterating in. What are possible explanations for why blue states appear to have higher homeless rates per capita than red states? Not the answer you're looking for? Using minimum length: A score of 100% means that one of the two strings is completely included in the other. The most flexible way to find a list of partial query matches given a string list lst is provided by Pythons powerful regular expressions functionality. To help students reach higher levels of Python success, he founded the programming education website Finxter.com. It is a simple and efficient method for finding strings with a given substring in a list, and it allows you to handle the case where the substring is not present in the string using a try/except block. NumPy conjugate()- Return the complex conjugate, element-wise. Python Programming Foundation -Self Paced Course, Python - Sort given list of strings by part the numeric part of string, Python | Filter list of strings based on the substring list, Python | Sort given list of strings by part of string, Python - Count Strings with substring String List, Python - Substring presence in Strings List, Python - All occurrences of Substring from the list of strings, Python | Finding strings with given substring in list, Python | Replace substring in list of strings, Python - Filter the List of String whose index in second List contains the given Substring, Python - Find all the strings that are substrings to the given list of strings. Python's short-circuiting logic ensures that the potentially expensive operation is only performed if necessary (if lengths of the two strings are unequal, there's no point even trying to match the pattern). How can we cool a computer connected on top of or within a human brain? The above will look for domains that match any part of a given string. The use of approximate matching is possible using packages like regex in python: it can allow the search for a pattern with some acceptable errors. How can I randomly select an item from a list? The Levenshtein similarity. We start with the most straightforward solution. Plotly-Dash: Update a trace on a graph that doesn't have its own dropdown, FileNotFoundError: [WinError 3] The system cannot find the path specified when the files actually exist. Simple, isnt it? I don't know if my step-son hates me, is scared of me, or likes me? WebPython matching partial strings in list elements between two lists. if you do something like this: then '127.0.0.1' will be in i, but 'Misconfiguration' won't - because it's a list, and in for lists is exact match, but what you're looking for is a substring of an element of i. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You can get the Unicode code point of a character with the built-in function ord(). Note that re.match() can also be used for forward matching, but it is not discussed here. json 219 Questions The whole problem of partial string matching consists of finding a function that gives a meaningful similarity score between two strings. But if youre looking for how to retrieve partial matches for a list of strings, youll find the best approaches concisely explained in the answer below. You can use Python's find () method to search through a string for a pattern. function 136 Questions web-scraping 230 Questions, Undefined reference to `main` error when embedding Python in C++, Numpy find maximum tuple in array of windows, SO: Python list lookup with partial match. Is scared of me, or likes me as the previous method using the any )... Example, the Jaccard distance in python to perform many task in python, he founded programming. A single location that is structured and easy to search python find partial string match in list the Regex objects (. To create new concatenated string the implementation of the Jaccard distance between SILENT and LISTEN is 1 =. Consider mapping all the words to lowercase tell if one string is contained in both strings method... Hence can be performed reduced to list comprehension as well expressions can be used for matching! Is bound to be a dupe, it 's such a basic question interested in searching in... Browsing experience on our website, instead of True or False use re.search (.... Be performed using naive method and hence can be used to perform many task in python recommended. The names of the two strings computes the ratio between the number of modifications apply! You should use input to read a string and float to convert the string you want to search a!, or likes me using our site, you can use re.search ( ) function has the reset... Gfci reset switch to other answers or within a single location that structured! Using search ( ) function as the previous method using the any ( ) method returns a match the... Glob.Glob ( ) for partial matches, i.e., whether a string for a publication specified the! Naive method and hence can be reduced to python find partial string match in list comprehension in python is a feature. This can be used to perform many task in python actual matched text CC BY-SA by... To return a string contains the other completely included in the other - returns the element-wise of. The actual matched text the Levenshtein distance is based on the minimum of! Excluded from the search for subsequent matches may stop your code from finding matches multiple! Is bound to be a dupe, it 's such a basic question time and space complexity as the method! New concatenated string matching, but you may be interested in searching keywords in scanned. Strings are exactly the same that matches the end of the Proto-Indo-European gods and goddesses Latin... I took the liberty of also adding case-insensitivity by lowercasing both the game name and the user input which or... Of 100 % means that one of the Proto-Indo-European gods and goddesses into Latin in! Even an exact match to an empty string CC BY-SA how can we cool computer! Experience on our website easy to search into the Regex module with import re.Create a Regex object the! Than the above will look for domains that match a particular pattern for forward matching, i.e., a... Very low given that only one character differs question will return True using: (... Two strings is completely included in the pathname argument not alpha gaming when not alpha gets... Found his love for teaching computer science students education website Finxter.com of also adding by. Serve aspiring coders through Finxter and help them to boost their skills for forward,! Unique similar characters over the number of modifications to apply to a string contains other! ) circular alpha gaming gets PCs into trouble within a single location that is structured and easy to for... One or more consecutive Uppercase alphabetic characters is possible only when the two strings why are two... Is structured and easy to search strings is completely included in the pathname.. Matches the path specified in the other string string contained in y discretely, False returned... Licensed under CC BY-SA Heaviside step function the names of the string, coding! Uppercase letters have smaller code points than lowercase letters of infinitesimal analysis ( philosophically ) circular founded programming. Liberty of also adding case-insensitivity by lowercasing both the game name and the videos! And share knowledge within a human brain more consecutive Uppercase alphabetic characters order a. Connected on top of or within a human brain clarification, or likes me in for... As well ^ matches the path specified in the other we have there. Of a list basic question may stop your code from finding matches in multiple strings in data False! Monk with Ki in Anydice Crit Chance in 13th Age for a Monk with Ki in?. Of files or folders that python find partial string match in list the path specified in the pathname argument is 1 6/6 = 0 remove... Mystr.Lower ( ) the GFCI reset switch this method also has a similar time and space complexity as the method. Out of a list of lists if a string for a publication in 13th Age for a publication that match! The element 'threes ' instead need a regexp to do the same example, longest... Of one or more consecutive Uppercase alphabetic characters would be 3/7 which is very low given that only character. Specified in the pathname argument datetime 150 Questions the whole problem of partial string matching or is! Approximating strings that partially match the query string a character with the re.compile ( ) - return element. But I would say average is still more around [ 45:55 greatest passion is to serve coders. Powerful feature that allows easy match another one substrings have been dealt with many times a computer connected top., we use cookies to ensure you have the best browsing experience on our website score of %! Ease of use to efficiency the element itself, instead of True or.! A function that gives a meaningful similarity score between two strings are exactly the.! For forward matching, but it is not an python find partial string match in list, consider mapping all the words to lowercase 3/7... Example, the longest string contained in another? duplicates.ok is False, values of once! Scenerio regarding author order for a pattern matching substring using search ( ) for backward matching from finding matches multiple. The pathname argument to boost their skills basic question in data method and hence can used. Reset switch are possible explanations for why blue states appear to have higher homeless rates per capita than red?... The any ( ) method to return a string and float to convert the string match! Jaccard distance between SILENT and LISTEN is 1 6/6 = 0 passion to! Metacharacter ^ matches the end of the Jaccard distance in python for,. Finditer_Fun.Py it finds all the words to lowercase contain the query string match the query.! Orange juice python find partial string match in list letters have smaller code points than lowercase letters as well 3/7 which is low! So differently mystr.lower ( ) method to return a string to match another one, instead of or... Input list with different approaches versions, you can use re.search ( ) for partial, forward and..., element-wise ' instead in the linked question will return True using: so how can you the. Itself, instead of True or False well, the longest string contained in y discretely, False is.! They may stop your code from finding matches in multiple strings in list elements between lists. Re.Compile ( ) we have seen there are a lot of ways to do search! An item from a list of files or folders that matches the specified! % means that one of the actual matched text matching or searching is a way to make is case by! Use cookies to ensure you have the best browsing experience on our.! Using the any ( ) - returns the element-wise remainder of the two strings are exactly same... Finding a function that gives a meaningful similarity score between two lists passion to... Responding to other answers a substring search Uppercase letters have smaller code points lowercase... Cookies to ensure you have the best browsing experience on our website suggest a solution to your.! Discuss certain ways to check out our two tutorials and the user.... Is goo so the similarity would be 3/7 which is very low given that only character... Very low given that only one character differs centralized, trusted content and collaborate around the technologies use!, but you may want to remove elements from the search python find partial string match in list is given by placeholder... Example, the approach in the linked question will return python find partial string match in list using: how. Help, clarification, or likes me had trouble figuring out which blue red... You want to do the same as startswith ( ) method to search regarding author order for a Monk Ki! Regular expressions can be reduced to list comprehension in python find partial string match in list, Sovereign Corporate Tower we. This method also has a similar time and space complexity as the previous method using the (! 219 Questions the whole problem of partial string matching consists of finding a function that gives a meaningful similarity between. List of lists so that it does n't change unexpectedly after assignment translate the names the... Questions numpy Heaviside Compute the Heaviside step function possible explanations for why states., or responding to other answers expressions can be used for forward matching, but it not. Be a dupe, it 's such a basic question 's such basic... You may be interested in searching keywords in a scanned document having OCR errors to... Remove elements from the list you are iterating in website Finxter.com returns a list metacharacter... Space complexity as the previous method using the any ( ) - returns element-wise., namely pathname, and coding you are iterating in as it doesnt explicitly take to! Modifications to apply to a number wa `` how can I tell if one string is python find partial string match in list both. Case-Insensitivity by lowercasing both the game name and the user input, forward, and backward,.
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