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

/
/
g

Test String

Code Generator

Language

Generated Code

$re = '/^(?:[^,]*\,){7}[\s]*(?P<SOURCE_PEER_IP>[\d\w\.:\-_;]+),/'; $str = '[1508738666710] sdclab010-10-site-1,,TT-0,Diameter,ULA,2001,sdclab010-10-site-1-2_cpf1,sdclab010-10-site-1-2_cpf1:3868,DRA101.epc.mnc002.mcc250.3gppnetwork.org,10.2.37.109,,RT-0,SB-0,,outTR-0,mmec38.mmegi9bdc.mme.epc.mnc002.mcc250.3gppnetwork.org;0;1496330010;1114,4,<ULA P C316 A16777251 H3963173446 E926568828 S8><Session-Id M mmec38.mmegi9bdc.mme.epc.mnc002.mcc250.3gppnetwork.org;0;1496330010;1114/><Origin-Host M PCRF1/><Subscription-Id-Data M No Subscription Id Data/><Framed-IP-Address M No Framed Ip Address/><Product-Name Some Product Name/><Result-Code M 2001/><Origin-Realm M traffixsystems.com/><Auth-Application-Id M 16777251/></ULA>'; preg_match_all($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