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

/
/
gm

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^.*?(?P<body>{.*})"; string input = @"{""channel"":""crm_process_booking_log"",""log_type"":""DEBUG"",""index_name"":""crm_process_booking_log"",""index_type"":""crm_process_booking_log"",""error_type"":0,""message"":{""data"":{""STEP"":""slot_details"",""slotDetail"":{""stm_id"":""684178718"",""time"":""14:30:00"",""end_time"":""15:30:00"",""locality_id"":0,""booking_id"":0,""freeze_count"":0,""date"":""2024-02-07"",""user_id"":0,""collection_center_id"":0,""b2b_zone_id"":0,""zone_id"":53,""sample_type_id"":1,""isavailable"":1,""isactive"":1,""set_name"":""set5"",""is_peak_hours"":0,""source"":""crm"",""order_group_id"":0,""old_zone_id"":0,""samplecollector_id"":0,""old_set_name"":"",""phlebo_name"":"",""assign_time"":""0000-00-00 00:00:00"",""freeze"":0,""freeze_date"":""0000-00-00 00:00:00"",""payment"":0,""locusStatus"":0,""lat"":"",""lng"":"",""dropTaskStatus"":0,""autoAssignStatus"":0,""pickup_type"":""home"",""service_id"":0,""consultation_id"":0,""channel_type"":0,""channel_user"":0,""vendor_user_id"":"",""created_at"":""2024-02-05 12:56:10"",""updated_at"":""2024-02-05 12:56:10"",""reference_stm_id"":0,""phlebo_id"":0},""amzn_trace_id"":""Root=1-65c33f1c-29fe535658001b076140677c""},""calling_trace"":{""file"":""\/var\/www\/newcrm-t25\/application\/controllers\/crmuser\/crmorder.php"",""line"":2112,""function"":""addProcessBookingLog"",""class"":""Enterprise_logger""}},""amzn_trace_id"":""Root=1-65c33f1c-29fe535658001b076140677c"",""nginx_request_id"":""c93176430784c9dd4e32e35541e6e31a"",""timestamp"":""2024-02-07 13:58:12""}"; 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