glob.go

Go Globbing Library.

Install

    go get git.internal/re/glob

Example

package main

import "git.internal/re/glob"

func main() {
    var g glob.Glob
    
    // create simple glob
    g = glob.MustCompile("*.github.com")
    g.Match("api.github.com") // true
    
    // quote meta characters and then create simple glob 
    g = glob.MustCompile(glob.QuoteMeta("*.github.com"))
    g.Match("*.github.com") // true
    
    // create new glob with set of delimiters as ["."]
    g = glob.MustCompile("api.*.com", '.')
    g.Match("api.github.com") // true
    g.Match("api.gi.hub.com") // false
    
    // create new glob with set of delimiters as ["."]
    // but now with super wildcard
    g = glob.MustCompile("api.**.com", '.')
    g.Match("api.github.com") // true
    g.Match("api.gi.hub.com") // true
        
    // create glob with single symbol wildcard
    g = glob.MustCompile("?at")
    g.Match("cat") // true
    g.Match("fat") // true
    g.Match("at") // false
    
    // create glob with single symbol wildcard and delimiters ['f']
    g = glob.MustCompile("?at", 'f')
    g.Match("cat") // true
    g.Match("fat") // false
    g.Match("at") // false 
    
    // create glob with character-list matchers 
    g = glob.MustCompile("[abc]at")
    g.Match("cat") // true
    g.Match("bat") // true
    g.Match("fat") // false
    g.Match("at") // false
    
    // create glob with character-list matchers 
    g = glob.MustCompile("[!abc]at")
    g.Match("cat") // false
    g.Match("bat") // false
    g.Match("fat") // true
    g.Match("at") // false 
    
    // create glob with character-range matchers 
    g = glob.MustCompile("[a-c]at")
    g.Match("cat") // true
    g.Match("bat") // true
    g.Match("fat") // false
    g.Match("at") // false
    
    // create glob with character-range matchers 
    g = glob.MustCompile("[!a-c]at")
    g.Match("cat") // false
    g.Match("bat") // false
    g.Match("fat") // true
    g.Match("at") // false 
    
    // create glob with pattern-alternatives list 
    g = glob.MustCompile("{cat,bat,[fr]at}")
    g.Match("cat") // true
    g.Match("bat") // true
    g.Match("fat") // true
    g.Match("rat") // true
    g.Match("at") // false 
    g.Match("zat") // false 
}

Performance

This library is created for compile-once patterns. This means, that compilation could take time, but strings matching is done faster, than in case when always parsing template.

If you will not use compiled glob.Glob object, and do g := glob.MustCompile(pattern); g.Match(...) every time, then your code will be much more slower.

Run go test -bench=. from source root to see the benchmarks:

Pattern	Fixture	Match	Speed (ns/op)
[a-z][!a-x]*cat*[h][!b]*eyes*	my cat has very bright eyes	true	432
[a-z][!a-x]*cat*[h][!b]*eyes*	my dog has very bright eyes	false	199
https://*.google.*	https://account.google.com	true	96
https://*.google.*	https://google.com	false	66
{https://*.google.*,*yandex.*,*yahoo.*,*mail.ru}	http://yahoo.com	true	163
{https://*.google.*,*yandex.*,*yahoo.*,*mail.ru}	http://google.com	false	197
{https://*gobwas.com,http://exclude.gobwas.com}	https://safe.gobwas.com	true	22
{https://*gobwas.com,http://exclude.gobwas.com}	http://safe.gobwas.com	false	24
abc*	abcdef	true	8.15
abc*	af	false	5.68
*def	abcdef	true	8.84
*def	af	false	5.74
ab*ef	abcdef	true	15.2
ab*ef	af	false	10.4

The same things with regexp package:

Pattern	Fixture	Match	Speed (ns/op)
^[a-z][^a-x].*cat.*[h][^b].*eyes.*$	my cat has very bright eyes	true	2553
^[a-z][^a-x].*cat.*[h][^b].*eyes.*$	my dog has very bright eyes	false	1383
^https:\/\/.*\.google\..*$	https://account.google.com	true	1205
^https:\/\/.*\.google\..*$	https://google.com	false	767
^(https:\/\/.*\.google\..*|.*yandex\..*|.*yahoo\..*|.*mail\.ru)$	http://yahoo.com	true	1435
^(https:\/\/.*\.google\..*|.*yandex\..*|.*yahoo\..*|.*mail\.ru)$	http://google.com	false	1674
^(https:\/\/.*gobwas\.com|http://exclude.gobwas.com)$	https://safe.gobwas.com	true	1039
^(https:\/\/.*gobwas\.com|http://exclude.gobwas.com)$	http://safe.gobwas.com	false	272
^abc.*$	abcdef	true	237
^abc.*$	af	false	100
^.*def$	abcdef	true	464
^.*def$	af	false	265
^ab.*ef$	abcdef	true	375
^ab.*ef$	af	false	145

Syntax

Syntax is inspired by standard wildcards, except that ** is aka super-asterisk, that do not sensitive for separators.