regex check if string contains multiple substrings

576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows, Potential U&L impact from TOS change on Imgur, PSA: Stack Exchange Inc. have announced a network-wide policy for AI content, Bash: handling "[[ statement ]] || echo problem found ; exit 1" logic, Why string comparision results always false, How to insert a string into a text variable at specified position, Script runs command fine, but fails when trying to save output to variable, Linux Bash OR operator in IF statement didn't work as expected. Scaling edges loop along themselves to a plane/grid. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. within the current sub-pattern) or the (?flags:x) operator (to match x with Another quick fix is to include the underscores in the value of $testseq: and then just use *"$testseq"* as the pattern (for a string comparison). How to Check if a Python String Contains a Substring ending is optional (hence why mine is followed by a ?). Thanks for contributing an answer to Stack Overflow! I just need all N substrings to be matched -- somewhere. @G.Grothendieck Added the word boundaries. Python: Check for Multiple Substrings in a String - Pencil Programmer regex - Functions - Configuration Language | Terraform | HashiCorp @Isaac In terms of reading and understanding what's happening, yes. I use the recommended word_tokenize from nltk: Here is the tokenized string from the accepted answer: The accepted answer gets modified as follows: As in the accepted answer, the word "more" is still matched. Connect and share knowledge within a single location that is structured and easy to search. We use the findall() method of the re module to get all the matches as a list of strings and pass it to any() method to get the result in True or False. zero. This works for the given use case of the question. I understand varargin, but I'm not clever enough with regexp to code an arbitrary number of substrings that must be matched. MathWorks is the leading developer of mathematical computing software for engineers and scientists. The start and end character will only search for those three strings. Asking for help, clarification, or responding to other answers. Just some more info on how to get all list elements availlable in String, It depends on the context Not sure I understand, if a is the list, and str is the thing to match against, what is the x? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Each observation will only contain either one of the 2 substrings (A|B). MathJax reference. You can put this into a function, and provide as many inputs as you want: Thanks you! In Germany, does an academic position after PhD have an age limit? The base solution would work even in that case since it uses exact matches rather than regular expressions. All of these strings have the following format: <c@=someText>Content<c> Example: This combination of plain text and <c=@flavor> colored text<c> is valid. Find the treasures in MATLAB Central and discover how the community can help you! If you want exact matches of words then consider word tokenizing the target string. The question is not about performance. e.g. I understand why it works. Asking for help, clarification, or responding to other answers. language, the quoted string itself already uses backslash \ as an escape I've taken 'foo' to be a complete domain name, not just a prefix. of the pattern must be escaped as \\. 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. Note, this assumes that each e-mail address is on a line on its own. The straightforward solutions take O(S*(A^2)), where S is the length of str and A is the sum of the lenghts of all strings in a. String.indexOf. I.e. But you describe three variables and I can't get what the third one is. Reload the page to see its updated state. should be more generic, the a shouldn't count, although the @ should. The input is specified as a list of strings vs. a longer string that might contain them as a substring, not as two lists of strings. when you have Vim mapped to always print two? I started this blog to share my little programming wisdom with other programmers out there. simple. Yes i knew how to do that but compared to Marks answer, that's horrible code. This answer also responds to the duplicate question here. Why does bunched up aluminum foil become so extremely hard to compress? You need to iterate on the elements of a. jbernadas already mentioned the Aho-Corasick-Algorithm in order to reduce complexity. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. If else statements to check if a string contains a substring in R, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. * It matches everything from the first . 2) base Split the input and for each element of the split Filter out the matches giving list L. It may be that L is sufficient for your needs but if not then the last line simplifies it to a vector and replaces zero length elements with NA. What is the procedure to develop a new force field for molecular simulation? Can you identify this fighter from the silhouette? What are some ways to check if a molecular simulation is running properly? When I set textto '378734493671000' (a valid amex credit card number), script prints out Found!, but if I keep that same text and add some text arround it, like this: '378734493671000 ABCDEFG', it prints out Not found!. the modified flags). 2 Answers Sorted by: 4 The problem with your current approach is that it can give incorrect results or raise an exception if any of the substrings contain characters that have special meaning in Python regular expressions. Is it possible to raise the frequency of command input to the processor in this way? any() and regex are a loss of time in this context. I don't need a index of substring matching the regex, just true\false. Or the _ immediately after the variable's name will be taken as part of the variable's name (it's a valid character in a variable name). Connect and share knowledge within a single location that is structured and easy to search. @Jonesy No I want the text inside the tags, and the tags itself. Accelerating the pace of engineering and science. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Not the answer you're looking for? "I don't like it when it is rainy." How does one show in IPA that the first sound in "get" and "got" is different? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. These are just the OPs example domains. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? Find centralized, trusted content and collaborate around the technologies you use most. Does the policy change for AI-generated content affect users who (want to) Identifying strings based on where substrings appear in the string, R -Multiple conditional matching in a string, R: tell if a substring exists in another string, Check if a particular string occurs within another string in R, Conditional regular expressions in stringr, R- Check if string contains only certain patterns, Detect substring within a string while not considering part of the substring. hasMatch=~isempty(regexp(st1,'^(?=.*going).*(?=.*search).*')). How does one show in IPA that the first sound in "get" and "got" is different? Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. regex - Python function for finding if all substrings exist in a string Find strings that contain multiple substrings at the same time Scaling edges loop along themselves to a plane/grid. Does the policy change for AI-generated content affect users who (want to) How do i check if a substring matches with regex? Is it possible for rockets to exist in a world that is only in the early stages of developing jet aircraft? Not the answer you're looking for? @Pat I am not surprised. Check whether a string matches a regex in JS. Check If a String Contains Multiple Keywords in Java | Baeldung All of these strings have the following format: Content. Should I trust my own thoughts when studying philosophy? But the case could go pretty complex and unbounded for sure. As you can see the in operator returns True if the string on its left is part of the string on its right. Well my answer works for your question, might not suit your particular case, but the beauty of stackoverflow is that it might help someone else, Nope, this wont work. Is there any evidence suggesting or refuting that Russian officials knowingly lied that Russia was not going to attack Ukraine? Each flag is a single letter, and multiple flags can be Using regexp to match multiple substrings, two questions Check for a particular substring pattern within a string and get all of its matches. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. using set.intersection. Of course my assumption is that your case is really as simple as you have listed. Expression should evaluate to True if st1 contains 'going' and 'search'. regular expression Thanks for contributing an answer to Code Review Stack Exchange! Can I also say: 'ich tut mir leid' instead of 'es tut mir leid'? Good point on the performance, thanks! Can I trust my bikes frame after I was hit by a car if there's no visible cracking? Why are mountain bike tires rated for so much lower pressure than road bikes? set at once by listing multiple letters in the flags position. Try the alrorithm with the following code: The regex module recommended in python docs, supports this. So I have this one string, which contains multiple occurrences of a substring. Very tidy solution. As correctly stated above, if it's counted as part of the string you're looking to match: 'bad || naughty' as a string, rather than an expression! indexOf gives us the first position where the substring is found, or -1 if it isn't found at all. Can I infer that Schrdinger's cat is dead without opening the box, if I wait a thousand years? Today most programmers care more for getting it done and readability. This executes much faster than list comprehension in large sets or lists. Insufficient travel insurance to cover the massive medical expenses for a visitor to US? You should consider other solutions. Sound for when duct tape is being pulled off of a roll. How to check if a string contains a substring in JavaScript No, @NoelGrandin there is no change on most shells (including dash), the, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. Hope it helps you. For the portable way to test if an string contains a substring, use: Or "${file##*"$testseq"*}" to avoid interpreting glob characters in testseq. Did Madhwa declare the Mahabharata to be a highly corrupt text? *c" and use search to find that anywhere in my string. We can overcome this by changing the strings to the same case (e.g lower), inside of the loop body: Alternatively, we can check for substring using the regular expression as discussed below. How can an accidental cat scratch break skin but not damage clothes? Doubt in Arnold's "Mathematical Methods of Classical Mechanics", Chapter 2. To learn more, see our tips on writing great answers. Find centralized, trusted content and collaborate around the technologies you use most. RE2 regular expression language. The problem you were having is that you weren't examining the elements of your array. I stole the following syntax from an old StackOverflow thread. While @Jonesy also has good code, yours is more clear and has no strings to select the groups. Select the China site (in Chinese or English) for best site performance. matching operators as described in the following table. Assume you have a vector of characters, you can use stringr::str_extract for this purpose: If a word match is preferred, use word boundaries \\b: If substring is defined by ", ", you can use this regex (?<=^|, )(A|B)(?=,|$): without using a package and working only with vectors: You can simplify this further but I left it in the expanded form so you can see how it works. There are multiple ways to check if a string contains a substring in JavaScript. The problem with your current approach is that it can give incorrect results "I thought there was a way for them not to beI thought there was a way for them not to be". First story of aliens pretending to be humans especially a "human" family (like Coneheads) that is trying to fit in, maybe for a long time? are you just wanting the text inside those tags? How can I manually analyse this simple BJT circuit? Accelerating the pace of engineering and science. regexall and test that the result has length greater than Should I trust my own thoughts when studying philosophy? Using case esac is one of the simplest ways to perform a pattern match in a portable way. hasBothMask = all(codeLookup(:,ismember(codes,strToFind)),2); sumDeptInv = sum(rbMarketValues(hasBothMask)). I would use this kind of function for speed: Yet another solution with set. How to match up to and including a condition with Regex in R? What are good reasons to create a city/nation in which a government wouldn't let you leave. test whether a given pattern matches a string, use ", Multiple Skip Multiple Pattern Matching Algorithm (MSMPMA), Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. What happens if a manifested instant gets blinked? My regex matches the first list but not the next two lists, and instructs how to do "or" generally in regular expressions, which answers the last part. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How can I shave a sheet of plywood into a wedge shim? Choose a web site to get translated content where available and see local events and offers. How to check if multiple items from a list appear in a string? Based on your location, we recommend that you select: . I have a list that contains multiple strings for each observation (see below). Does the grammatical context of 1 Chronicles 29:10 allow for it to be declaring that God is our Father? You can also select a web site from the following list. The pattern is a string containing a mixture of literal characters and special actually, the '.' Regex to detect one of several strings Asked 14 years, 2 months ago Modified 6 years, 4 months ago Viewed 151k times 96 I've got a list of email addresses belonging to several domains. Why is it "Gaudeamus igitur, *iuvenes dum* sumus!" Would you want to use the value of the variable as a pattern, use *_${testseq}_* instead. We append the boolean results to a list and pass it to any() function to return True or False indicating whether any of the sub-strings are present in the string. You better replace them by word boundaries: Thanks for contributing an answer to Stack Overflow! This is exactly what I'm looking for. 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. you can use grepl to find strings that have the alphabets you're looking for. To learn more, see our tips on writing great answers. If you don't want the capture-group, use the non-capturing grouping symbol: (Of course I'm assuming "a" is OK for the front of the email address! Is there a faster algorithm for max(ctz(x), ctz(y))? What is it doing? How can I manually analyse this simple BJT circuit? to a string and returns the matching substrings. Noise cancels but variance sums - contradiction? I thought there was a way for them not to be. this answer works as well. Although testing a single string the way you show (whether a string disappears in a substitution). I test if file contains "gen". should the words only be matched if they are in exactly the order that you give them in? Reload the page to see its updated state. How can I correctly use LazySubsets from Wolfram's Lazy package? have special meaning in Python regular expressions. Note: I will need to loop it through > 1000 observations. Check if a string contains a given substring: in; Get the position of a given string: find(), rfind() Case-insensitive search; The re module in the standard library allows more flexible operation with regular expressions. I'd like a regex that will match addresses belonging to three specific domains (for this example: foo, bar, & baz). Does the policy change for AI-generated content affect users who (want to) how to match a string constructed by given sub strings by regular expression in C#, Finding multiple items in one substring with regex. Doubt in Arnold's "Mathematical Methods of Classical Mechanics", Chapter 2, I can't play the trumpet after a year: reading notes, playing on the same valve. In July 2022, did China have more nuclear weapons than Domino's Pizza locations? regex applies a Python check if any items of a tuple are in a string, If string contains one of several substrings Python. Should I trust my own thoughts when studying philosophy? Otherwise it returns False. Is Spider-Man the only Marvel character that has been represented as multiple non-human characters? Why are mountain bike tires rated for so much lower pressure than road bikes? I would think the forcing it to end is overkill. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. To learn more, see our tips on writing great answers. I'm surprised there aren't (yet) any answers comparing to a compiled regex in terms of perf, especially compared to size of the string and number of "needles" to search for. I want to find if all of a list of substrings exist in a string, in the correct order (with or without spaces between them), it seems to be a good use for regex. The includes () method is arguably the most common way of checking if a string contains a substring. However if I use the following regex )>. Python: Elegant solution to check if any substring is in list? The return type of regex depends on the capture groups, if any, in the pattern: If the pattern has no capture groups at all, the result is a single string covering the substring matched by the pattern as a whole. Why is Bb8 better than Bc7 in this position? This is one of the fastest method to check whether a string contains any of the given multiple substrings in Python. Does substituting electrons with muons change the atomic shell configuration? It's also easy to extend one test with more test cases without getting an "if-then-elif-then-elif" spaghetti. rather than "Gaudeamus igitur, *dum iuvenes* sumus!"? 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. It seems to vary depending on the relationship between the number of substrings and the length of the text; I guess in a real scenario one would model it with realistic data to see the best approach, If it was really time critical. There are a lot of terse, pythonic ways to accomplish what you want that would hide the essence of what was wrong with your code. What is the procedure to develop a new force field for molecular simulation? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. @Viesturs That's is the heart of the issue, yes. QGIS - how to copy only some columns from attribute table. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I have tried to solve this problem in two different ways. You just saved me from losing 12-16 more strands of hair. How can I correctly use LazySubsets from Wolfram's Lazy package? are trying to match, prefer to use that function instead. The basic iteration over each element to test (function 2) is at least 50% faster than using. That is the easiest way to show your thanks to the, You may receive emails, depending on your. regex [abc] also works perfectly well and will be faster if there are more than a couple of candidates to test. 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. I have found a solution, but I am convinced that there must be a more elegant and efficient way of achieving this. 1) strapply (gsubfn) Use strapply in gsubfn. Other MathWorks country sites are not optimized for visits from your location. match, there are some additional operators that only match, but consume

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