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
Processing...

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"""bitrate"":\d+,""width"":(\d+),""height"":(\d+)"; string input = @",""mimeType"":""video/mp4;+codecs=\""avc1.42001E,+mp4a.40.2\"",""bitrate"":353051,""width"":640,""height"":320,""lastModified"":""1543659519195688"",""contentLength"":""24469560"",""quality"":""medium"",""fps"":24,""qualityLabel"":""360p"",""projectionType"":""RECTANGULAR"",""averageBitrate"":35300;codecs=\""avc1.64001F,+mp4a.40.2\"",""bitrate"":987359,""width"":1280,""height"":640,""lastModified"":""1543660211977003"",""quality"":""hd720"",""fps"":24,""qualityLabel"":""720p"",""projectionType"":""RECTANGULAR2SzYpZXq8116S_3OkA"",""width"":336,""height"":188},{""url"":""https://i.ytimg.com/vi/ddsd/maxresdefault.jpg"",""width"":1920,""height"":1080}]},""videoDuration"":{""simpleText"":""14:03""},""left"":0.40175438,""width"":0.32280701,""top"":0.32554516,""aspectRatio"":1.7777778,""startMs"":""535093"",""endMs"":""555093"",""title"":{""accessibility"":{""accessibilityData"""; 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