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

/
/
gm

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"<a class=""list-group-item list-group-item-action "" href=""https:\/\/moodle-hs-ulm\.de\/course\/view\.php\?id=([0-9]*)""(?:.*\s){7}<span class=""media-body "">([^<]*)<\/span>"; string input = @"<nav class=""list-group""> <a class=""list-group-item list-group-item-action active"" href=""https://moodle-hs-ulm.de/"" data-key=""home"" data-isexpandable=""0"" data-indent=""0"" data-showdivider=""0"" data-type=""1"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""1"" data-isactive=""1"" data-hidden=""0"" data-preceedwithhr=""0""> <div class=""m-l-0""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-home fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body font-weight-bold"">Startseite</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/my/"" data-key=""home"" data-isexpandable=""0"" data-indent=""0"" data-showdivider=""0"" data-type=""70"" data-nodetype=""0"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""home""> <div class=""m-l-0""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-tachometer fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Dashboard</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/calendar/view.php?view=month"" data-key=""calendar"" data-isexpandable=""0"" data-indent=""0"" data-showdivider=""0"" data-type=""60"" data-nodetype=""0"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""1""> <div class=""m-l-0""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-calendar fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Kalender</span> </div> </div> </a> <div class=""list-group-item"" data-key=""mycourses"" data-isexpandable=""1"" data-indent=""0"" data-showdivider=""0"" data-type=""0"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""1"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""home""> <div class=""m-l-0""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body"">Meine Kurse</span> </div> </div> </div> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=88"" data-key=""88"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Algorithmen und Datenstrukturen INF3 (WS18/19)</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=397"" data-key=""397"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Analysis 2 für Informatiker</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=646"" data-key=""646"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Daba</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=67"" data-key=""67"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Einführung in MATLAB</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=551"" data-key=""551"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">i²</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=277"" data-key=""277"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Mobile App Dev</span> </div> </div> </a> <a class=""list-group-item list-group-item-action "" href=""https://moodle-hs-ulm.de/course/view.php?id=631"" data-key=""631"" data-isexpandable=""0"" data-indent=""1"" data-showdivider=""0"" data-type=""20"" data-nodetype=""1"" data-collapse=""0"" data-forceopen=""0"" data-isactive=""0"" data-hidden=""0"" data-preceedwithhr=""0"" data-parent-key=""mycourses""> <div class=""m-l-1""> <div class=""media""> <span class=""media-left""> <i class=""icon fa fa-graduation-cap fa-fw "" aria-hidden=""true"" aria-label=""></i> </span> <span class=""media-body "">Programmieren III / INF3A</span> </div> </div> </a> </nav>"; 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