Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • 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

/
/
g

Test String

Code Generator

Language

Generated Code

$re = '/£\d+\.\d{1,2}/'; $str = '<div style="float:left;"><a class="url" href="http://www.amazon.co.uk/AllThingsAccessory%C2%AE-Sports-Running-Jogging-... src="http://ecx.images-amazon.com/images/I/51bQWjrCioL._SL160_.jpg" alt="AllThingsAccessory Sports" border="0" hspace="0" vspace="0" /></a></div><span class="riRssTitle"><a href="http://www.amazon.co.uk/AllThingsAccessory%C2%AE-Sports-Running-Jogging-...® Sports Running Jogging Gym Armband Arm Band Case Cover Holder For iPhone 6 5 5S 5C 4S 4</a></span> <br /><span class="riRssContributor">AllThingsAccessory®</span> <br /><img src="http://g-ecx.images-amazon.com/images/G/02/x-locale/common/icons/uparrow... width="13" align="abstop" alt="Ranking has gone up in the past 24 hours" title="Ranking has gone up in the past 24 hours" height="11" border="0" /> <font color="green"><strong>52,006%</strong></font> Sales Rank in Sports & Outdoors: 50 (was 26,053 yesterday) <br /> <img src="http://g-ecx.images-amazon.com/images/G/02/detail/stars-4-5._V192253866_... width="64" height="12" border="0" style="margin: 0; padding: 0;"/>(51)<br /><br /><a href="http://www.amazon.co.uk/AllThingsAccessory%C2%AE-Sports-Running-Jogging-... new: </a> <strike>£7.99 - £9.99</strike> <font color="#990000"><b>£4.99</b></font> <br /><br />(Visit the <a href="http://www.amazon.co.uk/gp/movers-and-shakers/sports/ref=pd_zg_rss_ms_sg... & Shakers in Sports & Outdoors</a> list for authoritative information on this product\'s current rank.)'; preg_match_all($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