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regexp: improve Regexp.ReplaceAll documentation and tests related to Expand part

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Fixes #40329
This commit is contained in:
Eduard Bondarenko 2020-07-24 16:52:53 +03:00
parent f0894a00f4
commit c017d4c7c1
2 changed files with 18 additions and 4 deletions
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14
src/regexp/example_test.go
View file

@ -228,11 +228,18 @@ func ExampleRegexp_ReplaceAll() {
fmt.Printf("%s\n", re.ReplaceAll([]byte("-ab-axxb-"), []byte("$1")))
fmt.Printf("%s\n", re.ReplaceAll([]byte("-ab-axxb-"), []byte("$1W")))
fmt.Printf("%s\n", re.ReplaceAll([]byte("-ab-axxb-"), []byte("${1}W")))
re2 := regexp.MustCompile(`a(?P<1W>x*)b`)
fmt.Printf("%s\n", re2.ReplaceAll([]byte("-ab-axxb-"), []byte("$1W")))
fmt.Printf("%s\n", re2.ReplaceAll([]byte("-ab-axxb-"), []byte("${1}W")))
// Output:
// -T-T-
// --xx-
// ---
// -W-xxW-
// --xx-
// -W-xxW-
}
func ExampleRegexp_ReplaceAllLiteralString() {
@ -252,11 +259,18 @@ func ExampleRegexp_ReplaceAllString() {
fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1W"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "${1}W"))
re2 := regexp.MustCompile(`a(?P<1W>x*)b`)
fmt.Printf("%s\n", re2.ReplaceAllString("-ab-axxb-", "$1W"))
fmt.Println(re.ReplaceAllString("-ab-axxb-", "${1}W"))
// Output:
// -T-T-
// --xx-
// ---
// -W-xxW-
// --xx-
// -W-xxW-
}
func ExampleRegexp_ReplaceAllStringFunc() {

8
src/regexp/regexp.go
View file

@ -573,8 +573,8 @@ func Match(pattern string, b []byte) (matched bool, err error) {
}
// ReplaceAllString returns a copy of src, replacing matches of the Regexp
// with the replacement string repl. Inside repl, $ signs are interpreted as
// in Expand, so for instance $1 represents the text of the first submatch.
// with the replacement string repl.
// Inside repl, $ signs are interpreted as in Expand.
func (re *Regexp) ReplaceAllString(src, repl string) string {
n := 2
if strings.Contains(repl, "$") {
@ -672,8 +672,8 @@ func (re *Regexp) replaceAll(bsrc []byte, src string, nmatch int, repl func(dst
}
// ReplaceAll returns a copy of src, replacing matches of the Regexp
// with the replacement text repl. Inside repl, $ signs are interpreted as
// in Expand, so for instance $1 represents the text of the first submatch.
// with the replacement text repl.
// Inside repl, $ signs are interpreted as in Expand.
func (re *Regexp) ReplaceAll(src, repl []byte) []byte {
n := 2
if bytes.IndexByte(repl, '$') >= 0 {