Regular Expressions 101

Save & Share

  • Regex Version: ver. 10
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

/
/
gi

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression. sed -E 's/(\[img.*?\].*?photobucket.*?&#46;jpg)(\[\\/img.*?\])/$1~original$2/gi;t' <<< "Connecting rod fitted to prevent steering tie rod from cranking: [url=http&#58;//s557&#46;photobucket&#46;com/user/realboss7669/media/F707F408-829F-48B9-9AED-BB57CEFF96C0_zpslwioah0z&#46;jpg&#46;html:jaeyh8wg][img:jaeyh8wg]http&#58;//i557&#46;photobucket&#46;com/albums/ss16/realboss7669/F707F408-829F-48B9-9AED-BB57CEFF96C0_zpslwioah0z&#46;jpg[/img:jaeyh8wg][/url:jaeyh8wg] From the rear: [url=http&#58;//s557&#46;photobucket&#46;com/user/realboss7669/media/05AE0DB2-83FD-4B2C-9FDA-E3257DFEB832_zpsc6cfuqwi&#46;jpg&#46;html:jaeyh8wg][img:jaeyh8wg]http&#58;//i557&#46;photobucket&#46;com/albums/ss16/realboss7669/05AE0DB2-83FD-4B2C-9FDA-E3257DFEB832_zpsc6cfuqwi&#46;jpg~original[/img:jaeyh8wg][/url:jaeyh8wg] Steering damper mounts finished - without the connecting rod the damper would get bent: [url=http&#58;//s557&#46;photobucket&#46;com/user/realboss7669/media/C85A0F5D-413D-4779-9F09-BD43BB798238_zpse8s6dxyu&#46;jpg&#46;html:jaeyh8wg][img:jaeyh8wg]http&#58;//i557&#46;photobucket&#46;com/albums/ss16/realboss7669/C85A0F5D-413D-4779-9F09-BD43BB798238_zpse8s6dxyu&#46;jpg[/img:jaeyh8wg][/url:jaeyh8wg] <!-- s8) --><img src=\"{SMILIES_PATH}/icon_cool.gif\" alt=\"8)\" title=\"Cool\" /><!-- s8) -->"

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 SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html