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I use regex101 every time I want write a new regex.

Small tip, regex101 has night mode.

Rulex is nice.


  • .* = will select all occurrences
  • A regex is useful for validating simple patterns and for finding patterns in text. For anything beyond that it’s almost certainly a terrible choice.


Match if it has notes or twitter in input ^(?=.*(?:notes|twitter)).*

Match all that don't have notes or twitter in input ^(?!._(?:notes|twitter))._