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 = /(<[ul|ol][^>]*?style=\"[^>]*?)(list-style-type:[a-zA-Z0-9:\.\s\(\)\-\,]*;?)([^\"]*\"[^>]*?>)/ str = '<ul style="list-style-type:disc"> <li>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut <ul style="list-style-type:circle"> <li>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut</li> <li>aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit</li> <li>In voluptate velit esse cillum dolore eu fugiat nulla pariatur. <ul style="list-style-type:square"> <li>Excepteur sint occaecat cupidatat non proident.</li> <li>Sunt in culpa qui officia deserunt mollit anim id est laborum.</li> </ul> <ul style="list-style-type:square; abc:asd; qwe:10pt"> <ul style="aaa:eeee; list-style-type:square; abc:asd; qwe:10pt" asdas="aeee"> <ul asdsa="eee" style="aaa:eeee; list-style-type:square; abc:asd; qwe:10pt" asdas="aeee"> <ul style="list-style-type:circle;"><li cke:reset="1" cke:indent="1" cke:listsymbol="o" style=""><span></span><span>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut</span><ul style="list-style-type:square;"><li cke:indent="2" cke:listsymbol="§" style=""><span></span><span>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut</span></li><li cke:indent="2" cke:listsymbol="§" style=""><span></span><span>aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit</span></li><li cke:indent="2" cke:listsymbol="§" style=""><span></span><span>In voluptate velit esse cillum dolore eu fugiat nulla pariatur. </span><ul style="list-style-type:disc;"><li cke:indent="3" cke:listsymbol="·" style=""><span></span><span>Excepteur sint occaecat cupidatat non proident.</span></li><li cke:indent="3" cke:listsymbol="·" style=""><span></span><span>Sunt in culpa qui officia deserunt mollit anim id est laborum.</span></li></ul></li></ul></li><li cke:indent="1" cke:listsymbol="o" style=""><span></span><span>aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit</span><ul style="list-style-type:square;"><li cke:indent="2" cke:listsymbol="§" style=""><span></span><span>In voluptate velit esse cillum dolore eu fugiat nulla pariatur. <ol style="list-style-type:lower-roman;"> ' # Print the match result str.scan(re) do |match| puts match.to_s end

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html