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 = #"(?ms)\<test\s(?P<tmp>.*?)\<\/test\>"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #""" <?xml version="1.0" encoding="UTF-8" ?> <unitData endtime="2019-09-30T05:39:08+02:00" equipment="eq1" equipmentClass="eqc1" locale="german" operator="ADMINISTRATOR" senderID="sender1" starttime="2019-09-30T05:38:09+02:00" state="nok" unit="74375513159930675" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="unitData-1.1.xsd"> <subUnitData position="1" positionType="Panel Nr." state="ok" subUnit="74375513159930675"> <test description="A10-007 7437551" name="CU102_BAY2_QR" testResultCode="passed"> <subTest name="Verbindung zum Pr³fling aufbauen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Initialisierung" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Fehlerflag lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ID lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Sachnummer lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Trigger setzen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ADC Abschalten" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> </test> </subUnitData> <subUnitData position="2" positionType="Panel Nr." state="ok" subUnit="74375513159930676"> <test description="A10-007 7437551" name="CU102_BAY2_QR" testResultCode="passed"> <subTest name="Verbindung zum Pr³fling aufbauen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Initialisierung" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Fehlerflag lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ID lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Sachnummer lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Trigger setzen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ADC Abschalten" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> </test> </subUnitData> <subUnitData position="3" positionType="Panel Nr." state="ok" subUnit="74375513159930678"> <test description="A10-007 7437551" name="CU102_BAY2_QR" testResultCode="passed"> <subTest name="Verbindung zum Pr³fling aufbauen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Initialisierung" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Fehlerflag lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ID lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Sachnummer lesen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="Trigger setzen" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> <subTest name="ADC Abschalten" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> </test> </subUnitData> <subUnitData position="4" positionType="Panel Nr." state="nok" subUnit="74375513159930677"> <test description="A10-007 7437551" name="CU102_BAY2_QR" testResultCode="failed"> <subTest name="FLOAT" testPosition="unknown"> <subPositions> <subPosition name="{27}"/> </subPositions> <subTestResult testResultClass="fail" testResultCode="failed"/> </subTest> <subTest name="Components not tested" testPosition="unknown"> <subTestResult testResultClass="pass" testResultCode="passed"/> </subTest> </test> </subUnitData> </unitData> """# 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