Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

r"
"
gm

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^C\w*(?:-\d+)?(?:-\d+)?\W*111\b"; string input = @"V0EQ21309-128 1 1001600535.99N0023642.63E 478409.56662024.7 107.91520748348 S0EQ21309-128 11 1001600532.60N0023645.31E 478450.26661919.6 0.01520748348 T0EQ21309-128 1 1 1001600452.10N0023713.63E 478880.66660664.0 0.01520748348 T0EQ21309-128 1 2 1001600452.35N0023715.00E 478901.96660671.8 0.01520748348 C0EQ21309-128 111 1001600532.07N0023645.24E 478449.06661903.2 0.01520748348 C0EQ21309-128 113 1001600532.22N0023646.01E 478461.06661907.6 0.01520748348 C012PA105 111 1003660607.77N0080416.09E 458009.87331794.0 365.21171920443 C012PA105 113 1003660607.96N0080415.12E 457997.77331800.2 365.21171920443 C012PA105 122 1004660607.65N0080415.58E 458003.57331790.5 365.31171920472 C012PA105 124 1004660607.84N0080414.62E 457991.47331796.6 365.31171920472"; 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