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
  • 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

/
/
g

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"\S+\[v=\"(standard)-(\w+)\",g=\"(\w+)\",p=\"(\S+)\"\]\S+\/(returns|mpt_statistics)\/\w+\/(\w+)\/(\w+)"# let regex = try! NSRegularExpression(pattern: pattern) let testString = #""" root/4-825-ReturnAndStatsCompositeAPI[v="standard-return",g="asofdate",p="{"asOfDate":"2017-07-31"}"]/data/share_classes/array[3]/returns/maximum_offering_price/cumulative/one_day root/4-825-ReturnAndStatsCompositeAPI[v="standard-return",g="asofdate",p="{"asOfDate":"2017-07-31"}"]/data/share_classes/array[3]/mpt_statistics/absolute/gross/one_year/sharpe_ratio root/6-825-ReturnAndStatsCompositeAPI[v="standard-benchmark",g="mostRecent",p="{"asOfDate":""}"]/data/share_classes/array[0]/benchmark_types/benchmark_types_breakdown/array[3]/returns/net/cumulative/three_year root/6-825-ReturnAndStatsCompositeAPI[v="standard-benchmark",g="mostRecent",p="{"asOfDate":""}"]/data/share_classes/array[1]/benchmark_types/benchmark_types_breakdown/array[3]/mpt_statistics/absolute/net/one_year/skewness root/7-825-ReturnAndStatsCompositeAPI[v="standard-index",g="mostRecent",p="{"asOfDate":""}"]/data/share_classes/array[0]/indices/indices_breakdown/array[0]/returns/net/annualized/ten_year root/1-825-ReturnAndStatsCompositeAPI[v="standard-category",g="asofdate",p="{"asOfDate":"2017-07-31"}"]/data/share_classes/array[1]/peer_categories/morningstar_category/returns/net/cumulative/fifty_two_week root/12-825-ReturnAndStatsCompositeAPI[v="timeSeries-return",g="timeSeries",p="{"rollingPeriod":"1Y","numberOfPeriods":"5","asOfDate":"2016-12-31","startDate":"2011-12-31","frequency":"1Y"}"]/data/share_classes/array[1]/returns_series/returns/array[1]/net/cumulative """# 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