Regular expression - Wikipedia
https://en.wikipedia.org/wiki/Regular_expression22 rader · A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that specifies a search 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.
Regex - Common Operators
web.mit.edu › gnu › docThe result is a regular expression that will match a string if a matches its first part and b matches the rest. For example, `xy' (two match-self operators) matches `xy'. Repetition Operators. Repetition operators repeat the preceding regular expression a specified number of times. The Match-zero-or-more Operator (*)
regex101: build, test, and debug regex
https://regex101.comRegex Debugger. Sponsors. Jamstack at Scale .. Explanation. An explanation of your regex will be automatically generated as you type. Match Information. Detailed match information will be displayed here automatically. Quick Reference. Regular Expression. No Match / / …