Regular Expressions 101

Save & Share

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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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 = @"^\""(?<timestart>\d{4}\/\d{2}\/\d{2}\s\d{2}\:\d{2}\:\d{2})?([\""|\,]*)?(?<recipient>[\w|\.|\-|_|\d]*@(?<domainimpacted>[\w|\.|\-|_|\d]*))?([\""|\,]*)?(?<subject>[\w|\s|\#|\@|\±|\§|\d|\!|\$|\%|\^|\,|\.|\(|\)|\[|\]|\{|\}|\:|\-|\&|\*|\'|\=|\+]*)?([\""|\,]*)?(?<action>\w*)?([\""|\,]*)?(?<sender>[\w|\.|\-|_|\d]*@(?<domainorigin>[\w|\.|\-|_|\d]*))?([\""|\,]*)?(?<account>[\w|\.|\-|_|\d|\,|\s]*)?([\""|\,]*)?(?<status>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<object>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<reason>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<policy>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<objecttype>[\w|\.|\-|_|\d|\s|\,]*)?([\""|\,]*)?(?<size>[\d]*)?([\""|\,]*)?(?<command>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<objectname>[\w|\.|\-|_|\d]*)?([\""|\,]*)?(?<threatname>[\w|\.|\-|_|\d]*)?([\""|\,]*)?"; string input = @"""2020/04/07 08:26:21"",""shabbir.jafri@mcb.com.pk"",""REQUIRED ORIGINAL LC # 0054ILS200@!±026, MCB to MCB.(NOVATEX)"",""Accepted"",""ppta.treasury@lottechem.pk"",""None"",""None"",""None"",""Clean"",""None"",""Portable Document Format"",""131835"",""None"",""None"",""None"" ""2020/04/05 15:20:02"",""telecom.support@mcb.com.pk"",""MCB14005 Lhr: Gulberg Gelria - ATM Down"",""Accepted"",""Abbas.Zaheer@ncr.com"",""Zaheer, Abbas"",""Whitelisted"",""None"",""Spam"",""None"",""JPEG Interchange Format,JPEG Interchange Format,JPEG Interchange Format,JPEG Interchange Format"",""18837"",""None"",""None"",""None"" ""2020/04/07 08:27:02"",""narain.das@mcb.com.pk"",""New Doc 2020-04-07 13.25.15 - Page 1"",""Accepted"",""naraindas24@gmail.com"",""Narain Das"",""None"",""None"",""Clean"",""None"",""Portable Document Format"",""397990"",""None"",""None"",""None"""; 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