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regex101

The regex playground that explains every token as you type.

Tool·Developer·Free

Visit regex101.com
regex101 screenshot

About regex101

regex101 is the reference tool for building regular expressions: live matching, a token-by-token explanation panel, a debugger and support for multiple flavors including PCRE2, JavaScript, Python and Go. It is free and needs no account.

Best for: Use this when you are constructing a non-trivial regex and want to understand exactly why it matches.

Pros

  • Explains each part of the pattern in plain language
  • Multiple regex flavors with their real engine differences
  • Debugger shows the matching steps for tricky patterns

Cons

  • The multi-panel interface can overwhelm beginners
  • Saved permalinks are publicly accessible, so do not paste secrets

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