Regular Expressions 101

Save & Manage Regex

  • Current Version: 2
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"^(.*part).*(POLYPROPYLENE\sHOMOPOLYMER)"# let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive) let testString = ##" (CRE8 RXN LIGHT R) (CRE8 RXN WHITE ME) (MOUTHFEEL CREAM FLAVOR) .. 1 CATERPILLAR TRACTOR PARTS 1 NYLOK NUTS, TREE CLIP, 1 PLASTIC TUBING 1 POLYPROPYLENE HOMOPOLYMER 1 SLAC: ABRASIVE MATERIAL 1 STC: INDIAN TAN LACE BACKS 11 SHIPPER'S LOAD AND COUNT 2 AUTO PARTS 29 PLYWOOD & HANGING BAR 4 SACK PAPER US05 18 INCH 5 SLAC: ABRASIVE MATERIAL 5 SLAC:13 SACK PAPER US05 18 61 SACK PAPER US05 20 INCH 7 AUTO PARTS 8544.20 AES X20160114804751 AES X20160114821615 AES X20160121191181 AES X20160122257543 AES X20160122274102 AES X20160126421765 AES X20160126421789 AES X20160127481907 AES X20160127508512 CASES COMMODITY CODE : AES X20160 CONTAINER GLOVES HS CODE 4821.90 8517.70 HS CODE: 3917.32.0000 HS CODE: 7318.16.0000 HS CODE: 8412.21 INVOICE NO: 358672 MSO NO: 3579782 NOEEI 30.37(A) NON-HAZ PACKAGE MATERIALS FOR BASEBALL PACKAGES 1 X 40HQ SHIPPER OWNED PALLET PALLET CYLINDER PALLET SLAC 17 BOXES ON 1 PLT PALLET TAPE PALLETS AES X20160114844193 PALLETS HS CODE:7907.00 PALLETS INCH USNU PO# 4550051601 SKIDS HS CODE: 8708.29 SLAC 58 BOXES ON 1 PLT TELECOM EQUIPMENT USNU"## 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