Regular Expressions 101

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Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.

Regular Expression
No Match

Regex Versions

/

Delimiters

/
gm

Regex Flags

Test String

Substitution

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions