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

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(<a\b[^<]*?|(?<!^)\G)([^\/]*?)%20(?=(?![^\/]*\.jpg"">)[^\/""]*"">)"; string substitution = @"\1\2-"; string input = @"<a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/34%20-%20kv34%20-%20tomba%20di%20thumtmose%20iii""> KV34 Tomba di Thutmose III</a>:</b> Nella foto, la pianta della tomba</font></p> </td> </tr> </tbody></table> </div> <div align=""center""> <div align=""center""> <table border=""1"" width=""96%"" id=""table4""> <tbody align=""left""><tr> <td width=""11%"" align=""center""> <a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/06%20antichi%20egizi%20-%20Tomba%20di%20Amenofi.jpg""> <img border=""0"" src=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/06%20antichi%20egizi%20-%20Tomba%20di%20Amenofi%20ante.jpg"" width=""80"" height=""64"" alt=""/06 antichi egizi - Tomba di Amenofi"" /></a></td> <td width=""87%"" class=""style4""> <p class=""style3""> <b><a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/35%20KV35%20Tomba%20di%20Amenofi%20II"">KV35 Tomba di Amenofi II</a>; </b> Nella foto, il re davanti alla dea Hathor che gli offra il segno della vita.</p> </td> </tr> <tr> <td width=""11%"" align=""center""> <a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/24%20antichi%20egizi%20-%20tomba%20di%20Horemhab.jpg""> <img border=""0"" src=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/24%20antichi%20egizi%20-%20tomba%20di%20Horemhab%20ante.jpg"" width=""80"" height=""59"" alt=""24 antichi egizi - tomba di Horemhab"" /></a></td> <td width=""87%"" class=""style4""> <div class=""style3""> <b><a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/57%20kv57%20tomba%20di%20horemhab""> KV 57Tomba di Horemhab</a><font face=""Arial"" size=""2"">: </font></b><font face=""Arial"" size=""2"">Nella foto, il faraone è raffigurato di fronte a varie divinità</font></div> </td> </tr> <tr> <td width=""11%"" align=""center""> <a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/09%20antichi%20egizi%20-%20Tomba%20di%20Tutankhamen.jpg""> <img border=""0"" src=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/09%20antichi%20egizi%20-%20Tomba%20di%20Tutankhamen%20ante.jpg"" width=""80"" height=""92"" alt=""09 antichi egizi - Tomba di Tutankhamen"" /></a></td> <td width=""87%"" class=""style4""> <b><a href=""http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/62%20kv62%20tomba%20di%20tutankhamen"">KV62 Tomba di Tutankhamen:</a></b> Nella foto, <font face=""Arial"" size=""2"">un particolare della decorazione, con la barca solare ed i babbuini che alludono alla prima ora del libro dell'Amduat.</font></td> </tr> <tr> <td"; Regex regex = new Regex(pattern); string result = regex.Replace(input, substitution); } }

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