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

r"
"
g

Test String

Code Generator

Language

Generated Code

$re = '/var data\s*=\s*([^;]*});/'; $str = '<script type="text/javascript"> P.when(\'A\').register("ImageBlockATF", function(A){ var data = { \'colorImages\': { \'initial\': [{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41SnVVzKChL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41SnVVzKChL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY355_.jpg":[355,270],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY450_.jpg":[450,342],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY550_.jpg":[550,419],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY606_.jpg":[606,461],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY679_.jpg":[679,517]},"variant":"MAIN","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/416rXB0xcmL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/416rXB0xcmL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SY355_.jpg":[355,276],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SY450_.jpg":[450,349],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX425_.jpg":[547,425],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX466_.jpg":[600,466],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX522_.jpg":[672,522]},"variant":"PT01","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/51gQxeLTYhL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/51gQxeLTYhL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX355_.jpg":[251,355],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX450_.jpg":[318,450],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX425_.jpg":[300,425],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX466_.jpg":[329,466],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX522_.jpg":[369,522]},"variant":"PT02","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41d9m8J4MbL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41d9m8J4MbL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX355_.jpg":[142,355],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX450_.jpg":[180,450],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX425_.jpg":[170,425],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX466_.jpg":[187,466],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX522_.jpg":[209,522]},"variant":"PT03","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41zh%2BCGamHL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41zh%2BCGamHL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY355_.jpg":[355,260],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY450_.jpg":[450,330],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY550_.jpg":[550,403],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY606_.jpg":[606,444],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY679_.jpg":[679,498]},"variant":"PT04","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41sMHp-WegL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41sMHp-WegL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY355_.jpg":[355,258],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY450_.jpg":[450,327],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY550_.jpg":[550,400],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY606_.jpg":[606,441],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY679_.jpg":[679,494]},"variant":"PT05","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SL1364_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/416TFrjOFlL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/416TFrjOFlL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX355_.jpg":[231,355],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX450_.jpg":[293,450],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX425_.jpg":[277,425],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX466_.jpg":[304,466],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX522_.jpg":[340,522]},"variant":"PT06","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SL1341_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41%2BNMI0l9yL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41%2BNMI0l9yL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX355_.jpg":[190,355],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX450_.jpg":[240,450],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX425_.jpg":[227,425],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX466_.jpg":[249,466],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX522_.jpg":[279,522]},"variant":"PT07","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SY355_.jpg":[355,266],"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SY450_.jpg":[450,338],"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL.jpg":[500,375]},"variant":"AW01","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SY355_.jpg":[355,266],"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SY450_.jpg":[450,338],"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL.jpg":[500,375]},"variant":"AW02","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SY355_.jpg":[355,355],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SY450_.jpg":[450,450],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SX425_.jpg":[425,425],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SX466_.jpg":[466,466],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL.jpg":[500,500]},"variant":"AW03","lowRes":null}]}, \'colorToAsin\': {\'initial\': {}}, \'holderRatio\': 1.0, \'holderMaxHeight\': 700, \'heroImage\': {\'initial\': []}, \'weblabs\' : {} }; A.trigger(\'P.AboveTheFold\'); // trigger ATF event. return data; }); </script>'; 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