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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = @"^([c][pP][eE]:\/[AHOaho]?(:[A-Za-z0-9._\-~%]*){0,6})$|^(cpe:2\.3:[aho*\-](:(((\?*|\*?)([a-zA-Z0-9\-._]|(\\[\\*?!\""#$%&'()+,/:;<=>@\[\]\^`{|}~]))+(\?*|\*?))|[*\-])){5}(:(([a-zA-Z]{2,3}(-([a-zA-Z]{2}|[0-9]{3}))?)|[*\-]))(:(((\?*|\*?)([a-zA-Z0-9\-._]|(\\[\\*?!\""#$%&'()+,/:;<=>@\[\]\^`{|}~]))+(\?*|\*?))|[*\-])){4})$"; string input = @"PREFIXcpe:/o:redhat:rhel_aus:7.6::server cpe:/o:redhat:rhel_aus:7.6::server::SUFFIX PREFIXcpe:2.3:a:admin_management_xtended_project:admin_management_xtended:0.8:*:*:*:*:wordpress:*:* cpe:2.3:a:admin_management_xtended_project:admin_management_xtended:0.8:*:*:*:*:wordpress:*:*"" cpe:2.3:a:admin_management_xtended_project:admin_management_xtended:0.8:*:*:*:*:wordpress:*:** cpe:2.3:a:cherokee-project:cherokee_web_server:*:*:*:*:*:*:*:* cpe:/o:redhat:rhel_aus:7.6::server"; 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