You say that you "have a file containing a list of all words of a language" and you "would like to find all words containing some letters (in any order)." The re.match () method will start matching a regex pattern from the very first character of the text, and if the match found, it will return a re.Match object. Then type the letters to match within each word, separating them by S-SPC. You want to find any one out of a list of words, without you can see on regex101.com that you can choose a regex "flavour" on the top left, python is slightly different. I am having a hard time trying to match multiple words completely using regex, Google is looking to dismantle the Spotify-Apple "duopoly" in music distribution, overhauling its music service this week in the fourth attempt at convincing YouTube's billions of users to pay. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. Does the order of validations and MAC with clear text matter? 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI, Matching character ranges and paragraph breaks in Find in Microsoft Word, Regular Expression to match zero or more spaces in Microsoft Word, NotePad++ Get words with REGEX Pattern of Delimiters, How to construct a regex find/replace in word 2010. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What's the most energy-efficient way to run a boiler? check: http://ctags.sourceforge.net/ctags.html. Each lookahead will match any piece of text on a single line (.*?) Match the purchase order numbers for your company. What's the most energy-efficient way to run a boiler? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. While this is not an exact answer your grep question, but you should check the "ctags" command for generating tags file from the source code. Allows the regex to match the number if it appears at the beginning of a line, with no characters before it. Using standard basic regex recursively match starting from the current directory any .c file with the indicated words (case insesitive, bash flavour): If you need to search with a single grep command (for example, you are searching for multiple pattern alternatives on stdin), you could use: This would find anything which has word1 and word2 in either order, or alternative-word. You'll need to d a logical AND of two - one searching for each word. Asking for help, clarification, or responding to other answers. However, its hard-coded. The \ before the dash and period escapes these charactersthat is, it indicates that the dash and period aren't a regex special characters themselves. Solution has length exponential in N. Parsing quoted strings. Regular expressions - JavaScript | MDN So, the regex would trigger on any of these: but NOT trigger on ROCKET when it is found in something like. The word rocket will thus be in match group 1. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? For situations where you need to search on a large number of words, you can use awk as follows: (If you are a cygwin user, the command is gawk.). Match any word or phrase in the following list: (?i)(\W|^)(baloney|darn|drat|fooey|gosh\sdarnit|heck)(\W|$). How do I check if a string contains a specific word?