Regular Expressions 101

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Regular Expressions 101

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

Regular Expression

Regex Versions

/

Delimiters

/

Regex Flags

Unit Tests

given the string https://www.youtube.com/watch?v=jNQXAC9I… assert that regex does match
given the string https://youtu.be/jNQXAC9IVRw assert that regex does match

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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 PHP, please visit: http://php.net/manual/en/ref.pcre.php