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 = @"\[(\[?)(?P<shortcodename>\w\S+)(?![/w-])([^\]\/]*(?:\/(?!\])[^\]\/]*)*?)(?:(\/)\]|\](?:([^\[]*(?:\[(?!\/\2\])[^\[]*)*)\[\/\2\])?)(\[?)"; string input = @" [openandclose src=""1234"" id=""abc""]some content[/openandclose] [openwithattrs src=""1234"" id=""abc""] [mmbox_with-attrs title=""TOOL: Track Your Net Worth - Personal Capital"" link=""https://go.millennialmoney.com/personal-capital/"" image=""https://millennialmoney.com/wp-content/uploads/2020/05/personal-capital-square.jpg"" ctatext=""Get Started!"" desc=""With Personal Capital, you can see your net worth, analyze investments, and discover any hidden fees you weren&#8217;t aware of before &#8211; as well as set spending and saving goals."" price=""FREE"" color=""#32C4F3""] [HL_QUOTER] [open_only-] [mmtoplist_ma type=""Auto"" max=""2"" header=""0""] [tmf_investnow500 source=""isammtxt0000006"" header=""Where to invest $1000 right now"" aside=""Even More Stock Picks"" link=""https://www.fool.com/order/fe_offers/wf/602d8976-8f2f-41c3-9ddf-1ab6c2b5ba06?c=sa-inv-btr&amp;amp;utm_campaign=topmillennialtrends&amp;amp;utm_medium=ecap_widget&amp;amp;utm_source=millennialmoney&amp;amp;campaign=sa-bbn-evergreen""] [earningPotential amount=""$50,371"" timeframe=""yr""] [earningPotential]"; 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