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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package regexp_test
import (
"fmt"
"regexp"
)
func Example() {
// Compile the expression once, usually at init time.
// Use raw strings to avoid having to quote the backslashes.
var validID = regexp.MustCompile(`^[a-z]+\[[0-9]+\]$`)
fmt.Println(validID.MatchString("adam[23]"))
fmt.Println(validID.MatchString("eve[7]"))
fmt.Println(validID.MatchString("Job[48]"))
fmt.Println(validID.MatchString("snakey"))
// Output:
// true
// true
// false
// false
}
func ExampleMatchString() {
matched, err := regexp.MatchString("foo.*", "seafood")
fmt.Println(matched, err)
matched, err = regexp.MatchString("bar.*", "seafood")
fmt.Println(matched, err)
matched, err = regexp.MatchString("a(b", "seafood")
fmt.Println(matched, err)
// Output:
// true <nil>
// false <nil>
// false error parsing regexp: missing closing ): `a(b`
}
func ExampleRegexp_FindString() {
re := regexp.MustCompile("fo.?")
fmt.Printf("%q\n", re.FindString("seafood"))
fmt.Printf("%q\n", re.FindString("meat"))
// Output:
// "foo"
// ""
}
func ExampleRegexp_FindStringIndex() {
re := regexp.MustCompile("ab?")
fmt.Println(re.FindStringIndex("tablett"))
fmt.Println(re.FindStringIndex("foo") == nil)
// Output:
// [1 3]
// true
}
func ExampleRegexp_FindStringSubmatch() {
re := regexp.MustCompile("a(x*)b(y|z)c")
fmt.Printf("%q\n", re.FindStringSubmatch("-axxxbyc-"))
fmt.Printf("%q\n", re.FindStringSubmatch("-abzc-"))
// Output:
// ["axxxbyc" "xxx" "y"]
// ["abzc" "" "z"]
}
func ExampleRegexp_FindAllString() {
re := regexp.MustCompile("a.")
fmt.Println(re.FindAllString("paranormal", -1))
fmt.Println(re.FindAllString("paranormal", 2))
fmt.Println(re.FindAllString("graal", -1))
fmt.Println(re.FindAllString("none", -1))
// Output:
// [ar an al]
// [ar an]
// [aa]
// []
}
func ExampleRegexp_FindAllStringSubmatch() {
re := regexp.MustCompile("a(x*)b")
fmt.Printf("%q\n", re.FindAllStringSubmatch("-ab-", -1))
fmt.Printf("%q\n", re.FindAllStringSubmatch("-axxb-", -1))
fmt.Printf("%q\n", re.FindAllStringSubmatch("-ab-axb-", -1))
fmt.Printf("%q\n", re.FindAllStringSubmatch("-axxb-ab-", -1))
// Output:
// [["ab" ""]]
// [["axxb" "xx"]]
// [["ab" ""] ["axb" "x"]]
// [["axxb" "xx"] ["ab" ""]]
}
func ExampleRegexp_FindAllStringSubmatchIndex() {
re := regexp.MustCompile("a(x*)b")
// Indices:
// 01234567 012345678
// -ab-axb- -axxb-ab-
fmt.Println(re.FindAllStringSubmatchIndex("-ab-", -1))
fmt.Println(re.FindAllStringSubmatchIndex("-axxb-", -1))
fmt.Println(re.FindAllStringSubmatchIndex("-ab-axb-", -1))
fmt.Println(re.FindAllStringSubmatchIndex("-axxb-ab-", -1))
fmt.Println(re.FindAllStringSubmatchIndex("-foo-", -1))
// Output:
// [[1 3 2 2]]
// [[1 5 2 4]]
// [[1 3 2 2] [4 7 5 6]]
// [[1 5 2 4] [6 8 7 7]]
// []
}
func ExampleRegexp_ReplaceAllLiteralString() {
re := regexp.MustCompile("a(x*)b")
fmt.Println(re.ReplaceAllLiteralString("-ab-axxb-", "T"))
fmt.Println(re.ReplaceAllLiteralString("-ab-axxb-", "$1"))
fmt.Println(re.ReplaceAllLiteralString("-ab-axxb-", "${1}"))
// Output:
// -T-T-
// -$1-$1-
// -${1}-${1}-
}
func ExampleRegexp_ReplaceAllString() {
re := regexp.MustCompile("a(x*)b")
fmt.Println(re.ReplaceAllString("-ab-axxb-", "T"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1W"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "${1}W"))
// Output:
// -T-T-
// --xx-
// ---
// -W-xxW-
}
func ExampleRegexp_SubexpNames() {
re := regexp.MustCompile("(?P<first>[a-zA-Z]+) (?P<last>[a-zA-Z]+)")
fmt.Println(re.MatchString("Alan Turing"))
fmt.Printf("%q\n", re.SubexpNames())
reversed := fmt.Sprintf("${%s} ${%s}", re.SubexpNames()[2], re.SubexpNames()[1])
fmt.Println(reversed)
fmt.Println(re.ReplaceAllString("Alan Turing", reversed))
// Output:
// true
// ["" "first" "last"]
// ${last} ${first}
// Turing Alan
}
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