81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
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# substring [](https://travis-ci.org/toqueteos/substring) [](http://godoc.org/github.com/toqueteos/substring) [](https://github.com/toqueteos/substring/releases)
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Simple and composable alternative to [regexp](http://golang.org/pkg/regexp/) package for fast substring searches.
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## Installation
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The recommended way to install substring
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```
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go get -t gopkg.in/toqueteos/substring.v1
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```
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The `-t` flag is for fetching [gocheck](https://gopkg.in/check.v1), required for tests and benchmarks.
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## Examples
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A basic example with two matchers:
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```go
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package main
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import (
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"fmt"
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"regexp"
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"gopkg.in/toqueteos/substring.v1"
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)
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func main() {
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m1 := substring.After("assets/", substring.Or(
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substring.Has("jquery"),
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substring.Has("angular"),
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substring.Suffixes(".js", ".css", ".html"),
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))
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fmt.Println(m1.Match("assets/angular/foo/bar")) //Prints: true
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fmt.Println(m1.Match("assets/js/file.js")) //Prints: true
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fmt.Println(m1.Match("assets/style/bar.css")) //Prints: true
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fmt.Println(m1.Match("assets/foo/bar.html")) //Prints: false
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fmt.Println(m1.Match("assets/js/qux.json")) //Prints: false
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fmt.Println(m1.Match("core/file.html")) //Prints: false
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fmt.Println(m1.Match("foobar/that.jsx")) //Prints: false
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m2 := substring.After("vendor/", substring.Suffixes(".css", ".js", ".less"))
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fmt.Println(m2.Match("foo/vendor/bar/qux.css")) //Prints: true
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fmt.Println(m2.Match("foo/var/qux.less")) //Prints: false
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re := regexp.MustCompile(`vendor\/.*\.(css|js|less)$`)
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fmt.Println(re.MatchString("foo/vendor/bar/qux.css")) //Prints: true
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fmt.Println(re.MatchString("foo/var/qux.less")) //Prints: false
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}
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```
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## How fast?
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It may vary depending on your use case but 1~2 orders of magnitude faster than `regexp` is pretty common.
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Test it out for yourself by running `go test -check.b`!
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```
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$ go test -check.b
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PASS: lib_test.go:18: LibSuite.BenchmarkExample1 10000000 221 ns/op
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PASS: lib_test.go:23: LibSuite.BenchmarkExample2 10000000 229 ns/op
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PASS: lib_test.go:28: LibSuite.BenchmarkExample3 10000000 216 ns/op
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PASS: lib_test.go:33: LibSuite.BenchmarkExample4 10000000 208 ns/op
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PASS: lib_test.go:38: LibSuite.BenchmarkExample5 20000000 82.1 ns/op
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PASS: lib_test.go:48: LibSuite.BenchmarkExampleRe1 500000 4136 ns/op
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PASS: lib_test.go:53: LibSuite.BenchmarkExampleRe2 500000 5222 ns/op
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PASS: lib_test.go:58: LibSuite.BenchmarkExampleRe3 500000 5116 ns/op
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PASS: lib_test.go:63: LibSuite.BenchmarkExampleRe4 500000 4020 ns/op
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PASS: lib_test.go:68: LibSuite.BenchmarkExampleRe5 10000000 226 ns/op
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OK: 10 passed
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PASS
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ok gopkg.in/toqueteos/substring.v1 23.471s
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```
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License
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-------
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MIT, see [LICENSE](LICENSE)
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