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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/(__|_e)\(\s?((\'|")(((?!(?<!\\\\)\3).)*)\3)(\s?|\s?(,\s?(\'\'|""))?)\)/m'; $str = '// i want to match these __(\'Translate this\', \'\') __( \'Translate this\' ) __( \'There\\\'s a translation\' ) __(\'Translate this\' ) _e(\'Translate this\') esc_html_e(\'Translate this\') esc_html__(\'Translate this\') // i don\'t want to match these __(\'Translate this\', \'my-text-domain\') _e(\'Translate this\', \'my-text-domain\') // not managing _n( \'We deleted %d spam message.\', \'We deleted %d spam messages.\', $count, \'my-text-domain\' ) _x( \'Comment\', \'column name\', \'my-text-domain\' ) _ex( \'Comment\', \'column name\', \'my-text-domain\' );'; $subst = "$1( $2, 'YOUR-TEXT-DOMAIN' )"; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$result;

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