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