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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/^\d+\.\d+(?={[^{}]*}|\w+\\\\)/m'; $str = '#TimeMemoryFunctionLocation 10.0002365832{main}( ).../http.php:0 20.05691577072Zend\\Mvc\\Application->run( ).../http.php:48 30.06211677272Zend\\EventManager\\EventManager->triggerEventUntil( ).../Application.php:332 40.06211677272Zend\\EventManager\\EventManager->triggerListeners( ).../EventManager.php:179 50.06221677912Zend\\Mvc\\DispatchListener->onDispatch( ).../EventManager.php:322 60.06261682144WebService\\Controller\\User\\ManageAccountController->dispatch( ).../DispatchListener.php:138 70.06261682144WebService\\Controller\\User\\ManageAccountController->dispatch( ).../AbstractRestfulController.php:313 80.06261682464Zend\\EventManager\\EventManager->triggerEventUntil( ).../AbstractController.php:106 90.06261682464Zend\\EventManager\\EventManager->triggerListeners( ).../EventManager.php:179 100.06281686864WebService\\Controller\\User\\ManageAccountController->onDispatch( ).../EventManager.php:322 110.07321939200WebService\\Controller\\User\\ManageAccountController->onDispatch( ).../AbstractController.php:129 120.07321939232WebService\\Controller\\User\\ManageAccountController->processPostData( ).../AbstractRestfulController.php:429 130.07341945960WebService\\Controller\\User\\ManageAccountController->create( ).../AbstractController.php:234 140.08922331024Model\\Model\\UserModel->updateUser( ).../ManageAccountController.php:50 150.08932331464Model\\Mapper\\UserMapper->updateUserData( ).../UserModel.php:560 160.08932332744Application\\Database\\Connection->execute( ).../UserMapper.php:475 170.08942332840Zend\\Db\\Adapter\\Adapter->query( ).../Connection.php:77 180.08942244472Zend\\Db\\Adapter\\Driver\\Mysqli\\Statement->prepare( ).../Adapter.php:193'; $subst = ""; $result = preg_replace($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