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

/
/
gm

Test String

Code Generator

Generated Code

$re = '/^[a-z]\..*$/m'; $str = 'Instead of strings like " .*(?=\\.)" Lets have: matchCriteria: ..... str from source ..... where ..... str startswith Text.Anything # until one before period ..... until (source endswith Chars.Period) - 1 Possibly a markup language (RegXML) that will store RegExp information for SOA messaging. And a search tool for the desktop and for the web, with a WYSIWYG regexp editor that works as follows on any text: a. Load sample or text to search. b. Mouse over and mark the words or "sections" you are intending to search for inside the text. c. As you mark, each section is given its definitions: if its from the beginning or till the end of a word it will give the possible [b]Word (starting/ending/exactly) with markedword[b]. d. When standing on a section, you can mark it as being a "formatted text" or other. (if the section has slashes, hyphens and periods etc, it will suggest this automatically). e. Famous formats can be chosen and automatically detected. For example: Search for format of date: where day is: (any/between/less than) etc. f. Didn\'t think out the REPLACE functionality yet.'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($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