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Regex Engine

  • Most modern software and programming languages to be using some variation of the Perl Compatible Regular Expression, "PCRE";
  • however command-line tools (grep, less, ...) will often use the POSIX flavor (sometimes with an extended variant, e.g. egrep or sed -r).
  • Vim also comes with its own syntax (a superset of what Vi accepts).

Regex cheatsheet PCRE, Python, POSIX, POSIX extended, vim

Regular Expression in Perl, Python, and Emacs

regex-perl-python-emacs