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

import Foundation let pattern = #"^.*(?P<message>{.*})"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #"{"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":"Adding Post Data","post_data":{"customer":[{"relation":"others","age":28,"dob":null,"gender":"F","email":null,"customer_id":"66aff7d8-cd9b-4796-bf17-e66088c3565a","customer_name":"Prena","contact_number":null}],"slot":{"slot_id":"684178718"},"gender":"M","mobile":"6700670875","email":"siddhant.khanna_testi_blr+rahul@acko.tech","state":"26","cityId":"23","latitude":28.5101825,"longitude":77.0682661,"address":"sector 21, gurgaon, Gurgaon, Haryana, 122016","zipcode":"122016","landmark":"home","altmobile":false,"altemail":false,"package":[{"deal_id":["package_216"]}],"customer_calling_number":"6700670875","billing_cust_name":"Rahu","sub_locality":"sector 21, gurgaon, Gurgaon, Haryana, 122016","hard_copy":0,"vendor_booking_id":false,"vendor_billing_user_id":"4rWzYn5NOhEgNPdiVGWiRA","payment_option":"invoice","discounted_price":0,"sample_collected":"n","role_id":0,"search_by":"customer_mobile","channel_partner":"3","channel_partner_user":"5490","booked_source":"api","zip_search":2,"calling_from":"external_api","b2bNewExistingUser":false,"user_id_ajax":"","whatsappconcent":1,"billing_zone_id":"53","zone_id":"53","amzn_trace_id":"Root=1-65c33f1c-29fe535658001b076140677c","billing_cust_city":"gurgaon","billing_cust_city_id":"23","locality":"541","channel_type":"3","channel_user":"5490"},"amzn_trace_id":"Root=1-65c33f1c-29fe535658001b076140677c"},"calling_trace":{"file":"\/var\/www\/newcrm-t25\/application\/controllers\/crmuser\/crmorder.php","line":1227,"function":"addProcessBookingLog","class":"Enterprise_logger"}},"amzn_trace_id":"Root=1-65c33f1c-29fe535658001b076140677c","nginx_request_id":"c93176430784c9dd4e32e35541e6e31a","timestamp":"2024-02-07 13:58:12"}"# let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression