Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
U

Test String

Code Generator

Language

Generated Code

$re = '/<p>(.*)<\/p>/U'; $str = '<p>Lorem ipsum dolor sit amet, ius ex tota iriure. Impetus viderer mel at, an probo novum vituperatoribus nec, ne est maiorum euripidis. Integre sanctus dolorem cu vim, ei solet albucius pri. Te minim novum recusabo mea, vim ut lucilius maluisset, zril invidunt singulis sed id.</p><p>In consul salutandi cum. Te salutatus mnesarchum scriptorem sea, audire suavitate signiferumque ne vel. Alienum adversarium mel an, ius nulla tacimates at. Mentitum persequeris suscipiantur ne pri, et nam laudem oportere.</p><p>Ea melius ullamcorper eum, his probo euripidis necessitatibus ei. Eu lorem interesset usu, labore urbanitas ea usu. His te alii diam atqui. Eum an sapientem sadipscing. Autem latine voluptatibus per in, usu movet invidunt laboramus ex. Ne vim civibus perpetua definiebas, mei at cibo sale contentiones, vel dicant bonorum in. His ex doming constituto.</p>'; preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0); // Print the entire match result var_dump($matches);

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