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

/
/
gm

Test String

Code Generator

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"<form.+action=""(.*?)"".*>\n.*?<input.*?value=""(.*?)"".*>\n.*?<input.*?value=""(.*?)"".*>\n.*?<input.*?value=""(.*?)""|<input id=""(.*?)""|<input name=""(.*?)"""; string input = @"<form accept-charset=""UTF-8"" action=""https://appname.infusionsoft.com/app/form/process/6488f3cca2ac451a9d4f416c48f4c3bc"" class=""infusion-form"" id=""inf_form_6488f3cca2ac451a9d4f416c48f4c3bc"" method=""POST""> <input name=""inf_form_xid"" type=""hidden"" value=""6488f3cca2ac451a9d4f416c48f4c3bc"" /> <input name=""inf_form_name"" type=""hidden"" value=""Regex Text Webform"" /> <input name=""infusionsoft_version"" type=""hidden"" value=""1.70.0.369835"" /> <div class=""infusion-field""> <label for=""inf_field_FirstName"">Vorname</label> <input id=""inf_field_FirstName"" name=""inf_field_FirstName"" placeholder=""Vorname"" type=""text"" /> </div> <div class=""infusion-field""> <label for=""inf_field_Email"">Email *</label> <input id=""inf_field_Email"" name=""inf_field_Email"" placeholder=""Email *"" type=""text"" /> </div> <div class=""infusion-field""> <label for=""inf_field_Phone1"">Phone 1</label> <input id=""inf_field_Phone1"" name=""inf_field_Phone1"" placeholder=""Phone 1"" type=""text"" /> </div> <div class=""infusion-field""> <label for=""inf_custom_WebinarTitel0"">Webinar Titel</label> <input id=""inf_custom_WebinarTitel0"" name=""inf_custom_WebinarTitel0"" placeholder=""Webinar Titel"" type=""text"" /> </div> <div class=""infusion-field""> <label for=""inf_custom_WebinarTeilnahmelink0"">Webinar Teilnahmelink *</label> <input id=""inf_custom_WebinarTeilnahmelink0"" name=""inf_custom_WebinarTeilnahmelink0"" placeholder=""Webinar Teilnahmelink *"" type=""text"" /> </div> <input name=""inf_field_LeadSourceId"" type=""hidden"" value=""null"" /> <input name=""inf_custom_Quelle"" type=""hidden"" value=""null"" /> <div> <div>&nbsp;</div> </div> <div class=""infusion-submit""> <button class=""infusion-recaptcha"" id=""recaptcha_6488f3cca2ac451a9d4f416c48f4c3bc"" type=""submit"">Los gehts!</button> </div> </form> <script type=""text/javascript"" src=""https://appname.infusionsoft.app/app/webTracking/getTrackingCode""></script> <script type=""text/javascript"" src=""https://appname.infusionsoft.com/resources/external/recaptcha/production/recaptcha.js?b=1.70.0.369835-hf-202106081103""></script> <script src=""https://www.google.com/recaptcha/api.js?onload=onloadInfusionRecaptchaCallback&render=explicit"" async=""async"" defer=""defer""></script> <script type=""text/javascript"" src=""https://appname.infusionsoft.com/app/timezone/timezoneInputJs?xid=6488f3cca2ac451a9d4f416c48f4c3bc""></script> <script type=""text/javascript"" src=""https://appname.infusionsoft.com/js/jquery/jquery-3.3.1.js""></script> <script type=""text/javascript"" src=""https://appname.infusionsoft.app/app/webform/overwriteRefererJs""></script>"; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { 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