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

/
/
g

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"EGA-(?:(?!New=).)+(New=[:\d\/ ]+)"; string input = @"structure(list(flight_history_id = c(280604281L, 280316415L, 280315758L, 280316495L, 280303866L, 280303866L, 280271465L, 280271465L, 280271465L, 280271465L), date_time_recorded = structure(c(10L, 4L, 3L, 2L, 7L, 1L, 9L, 8L, 6L, 5L), .Label = c(""2012-11-12 05:50:23.547-08"", ""2012-11-12 15:38:10.099-08"", ""2012-11-12 16:10:06.968-08"", ""2012-11-12 17:25:08.814-08"", ""2012-11-12 17:58:14.268-08"", ""2012-11-13 05:16:41.01-08"", ""2012-11-13 06:51:45.831-08"", ""2012-11-13 07:38:19.593-08"", ""2012-11-13 07:54:22.588-08"", ""2012-11-13 17:55:58.673-08"" ), class = ""factor""), event = structure(c(1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c(""Arrival Estimation"", ""Time Adjustment"" ), class = ""factor""), data_updated = structure(c(3L, 8L, 7L, 4L, 2L, 5L, 1L, 10L, 9L, 6L), .Label = c(""AGD- New=11/13/12 10:22, EGA- Old=11/13/12 11:20 New=11/13/12 11:09"", ""AGD- Old=11/13/12 07:40 New=11/13/12 07:38, EGA- Old=11/13/12 10:25 New=11/13/12 10:18"", ""EGA- Based on Distance and Airspeed"", ""EGD- New=11/13/12 06:35, DGATE- New=A1, EGA- New=11/13/12 07:15"", ""EGD- New=11/13/12 07:45, DGATE- New=11, EGA- New=11/13/12 10:25, AGATE- New=A1"", ""EGD- New=11/13/12 08:55, EGA- New=11/13/12 09:45, AGATE- New=A1"", ""EGD- New=11/13/12 19:05, DGATE- New=A7, EGA- New=11/13/12 20:50, AGATE- New=C5"", ""EGD- New=11/13/12 20:20, DGATE- New=A1, EGA- New=11/13/12 21:00"", ""EGD- Old=11/13/12 08:55 New=11/13/12 10:05, EGA- Old=11/13/12 09:45 New=11/13/12 10:55"", ""EGD- Old=11/13/12 10:05 New=11/13/12 10:30, EGA- Old=11/13/12 10:55 New=11/13/12 11:20"" ), class = ""factor"")), .Names = c(""flight_history_id"", ""date_time_recorded"", ""event"", ""data_updated""), row.names = c(862L, 5514L, 5527L, 5539L, 5545L, 5558L, 5564L, 5566L, 5570L, 5572L), class = ""data.frame"")"; 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