A regular expression (shortened as regex or regexp; sometimes referred to as rational expression ) is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation.
Resources
- RegExr
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Learn, Build & Test RegEx
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- regex101
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build, test, and debug regex
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- Mozilla Developer Network
- Microsoft
- txt2re
Often used snippets
Lines with nothing but whitespace
^(\s)*$\n