Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
s

Test String

Code Generator

Language

Generated Code

$re = '/SQL: \[\d+\] (?<sql>.*) Sent SQL: \[\d+\] (?<send_sql>.*) Params:/s'; $str = 'SQL: [126] INSERT INTO `tbl_ip_data` (`ip_start`, `ip_end`, `region_id`, `country_id`, `create_at`) VALUES (:v0d, :v1d, :v2d, :v3d, :v4d) Sent SQL: [163] INSERT INTO `tbl_ip_data` (`ip_start`, `ip_end`, `region_id`, `country_id`, `create_at`) VALUES (\'1900145563\', \'1900145563\', \'440118\', \'CN\', \'2022-04-15 21:46:42\') Params: 5 Key: Name: [4] :v0d paramno=-1 name=[4] ":v0d" is_param=1 param_type=2 Key: Name: [4] :v1d paramno=-1 name=[4] ":v1d" is_param=1 param_type=2 Key: Name: [4] :v2d paramno=-1 name=[4] ":v2d" is_param=1 param_type=2 Key: Name: [4] :v3d paramno=-1 name=[4] ":v3d" is_param=1 param_type=2 Key: Name: [4] :v4d paramno=-1 name=[4] ":v4d" is_param=1 param_type=2 [] []'; preg_match($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