Please enable JavaScript to use regex101
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Reg
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Ex
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Regular Expression
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Input 1
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New
The concept arose in the 1950s, when the American mathematician Stephen Cole Kleene formalized the description of a regular language, and came into common use with Unix text-processing utilities. Today different syntaxes for writing regular expressions exist, one being the POSIX standard, another widely used being the Perl syntax.
Substitution
The concept arose in the 1950s, when the American mathematician Stephen Cole Kleene formalized the description of a regular language, and came into common use with Unix text-processing utilities. Today different syntaxes for writing regular expressions exist, one being the POSIX standard, another widely used being the Perl syntax.