Regular Expressions 101

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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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"var data\s*=\s*([^;]*});"; string input = @"<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>"; foreach (Match m in Regex.Matches(input, pattern)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx