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A Cross-Platform String and Regular Expression Library written in Swift.
.package(url: "https://github.com/ArtSabintsev/Guitar.git", from: "1.2.0")

Guitar 🎸

A Cross-Platform String and Regular Expression Library written in Swift.

Build Status Platform

Swift Support CocoaPods SwiftPM Compatible


This library seeks to add common string manipulation functions, including common regular expression capabilities, that are needed in both mobile and server-side development, but are missing in Swift's Standard Library.

The full documentation can be found at http://www.sabintsev.com/Guitar/.

Guitar is also part of Swift's Source Compatibility Suite.


  • ☑ Boolean Functions (isAlpha, isNumeric, isUppercase, etc.)
  • ☑ Case Functions (camelCased, pascalCased, kebabCased, etc.)
  • ☑ Latinization Functions (.latinized(), .withoutAccents())
  • ☑ Padding Functions (padLeft, padRight, pad)
  • ☑ Regular Expressions (with Common Patterns Built-in)


A small set of functions offered by Guitar were removed in v0.3.0 of the library as Apple added many of these features to the Swift 4 language (aka, Sherlocking). The functions that were removed were: first, last, length, prefixed, suffixed, trimLeft, trimRight, truncated. The reversed function was renamed to reversedString as it acts slightly differently than Swift's built-in reversed function.

Installation Instructions

Swift Version Branch Name Will Continue to Receive Updates?
5.1+ master Yes
5.0 swift5.0 No
4.2 swift4.2 No
4.1 swift4.1 No
3.2 swift3.2 No
3.1 swift3.1 No


pod 'Guitar' # Swift 5.1+
pod 'Guitar', :git => 'https://github.com/ArtSabintsev/Guitar.git', :branch => 'swift5.0' # Swift 5.0
pod 'Guitar', :git => 'https://github.com/ArtSabintsev/Guitar.git', :branch => 'swift4.2' # Swift 4.2
pod 'Guitar', :git => 'https://github.com/ArtSabintsev/Guitar.git', :branch => 'swift4.1' # Swift 4.1
pod 'Guitar', :git => 'https://github.com/ArtSabintsev/Guitar.git', :branch => 'swift3.2' # Swift 3.2
pod 'Guitar', :git => 'https://github.com/ArtSabintsev/Guitar.git', :branch => 'swift3.1' # Swift 3.1

Swift Package Manager

.Package(url: "https://github.com/ArtSabintsev/Guitar.git", majorVersion: 1)

Usage Examples

Regular Expression

  • Guitar makes it easier to use Regular Expressions to test and evaluate String objects.
  • Guitar.Chord enumerates common regular expressions and they are located in GuitarChord.swift.
  • GuitarCommon.swift contains a list of convenience methods for common regular expression evaluations and tests, such as checking the string to determine if it's a valid email address.


Guitar(pattern: String) // A custom regular expression with which to initialize Guitar.

Guitar(chord: Guitar.Chord) // A common regular expression with which to initialize Guitar.


evaluateForRanges(::) returns an array of ranges, [Range<String.Index>], that match a specific regular expression.

Guitar(chord: .firstCharacter).evaluateForRanges(from: "Hello world") // [Range(Swift.String.CharacterView.Index(_base: Swift.String.UnicodeScalarView.Index(_position: 0), _countUTF16: 1)..<Swift.String.CharacterView.Index(_base: Swift.String.UnicodeScalarView.Index(_position: 1), _countUTF16: 1)), Range(Swift.String.CharacterView.Index(_base: Swift.String.UnicodeScalarView.Index(_position: 6), _countUTF16: 1)..<Swift.String.CharacterView.Index(_base: Swift.String.UnicodeScalarView.Index(_position: 7), _countUTF16: 1))]

evaluateForStrings(::) returns an array of strings, [String], that match a specific regular expression.

Guitar(chord: .firstCharacter).evaluateForStrings(from: "Hello world") // ["H", "w"]

test(::) evaluates a string with a specific regular expression. true is returned if matches are found in the string. Otherwise, false is returned.

Guitar(chord: .email).test(string: "hello@world.com") // `true`

String Extension

This library also adds dozens of methods via String extensions that are missing in the Swift Standard Library or not easily accessible on the String class. Check GuitarBoolean.swift and GuitarPadding.swift to see these examples.

More specific examples can be found in the tests folder.


Created and maintained by

Arthur Ariel Sabintsev


Stars: 647
Last commit: 2 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

Project Architecture Changes
35 weeks ago

This is simply a a version bump so that less files are brought in when installing via SPM.

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API