mark-ingenosity/RegEx Negated Search.md

Created October 1, 2021 20:11

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match "does NOT contain EXPRESSION"

Raw

RegEx Negated Search.md

matches does NOT contain EXPRESSION

^((?!EXPRESSION.)*$

Explanation:

^the beginning of the string, ( group and capture to \1 (0 or more times (matching the most amount possible)),
(?! look ahead to see if there is not, hede your string,
) end of look-ahead, . any character except \n,
)* end of \1 (Note: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1)
$ before an optional \n, and the end of the string

matches does NOT start with EXPRESSION

^(?!EXPRESSION).*$

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