regexp: issue parse string

[Alter-stack]

Go version

go1.20

Output of go env in your module/workspace:

GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/Users/xxxx/go1.20/go1.20"
GOSUMDB="off"
GOTMPDIR=""
GOTOOLDIR="/Users/xxxx/go1.20/go1.20/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.20"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/jl/_cckn_y96kg7wnz6t3624xkr0000gn/T/go-build4144142847=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

func main() {
	pattern := fmt.Sprintf(`\b%s\b`, "ch")
	regex := regexp.MustCompile(pattern)
	result := regex.ReplaceAllStringFunc("chácara", func(match string) string {
		trimmedMatch := strings.TrimSpace(match)
		replacement := "replacement"
		return strings.ReplaceAll(match, trimmedMatch, replacement)
	})
	fmt.Println(result)
}

What did you see happen?

actually result is "replacementácara"

What did you expect to see?

except result is "chácara"

[Alter-stack]

sorry， code is：

func main() {
	pattern := fmt.Sprintf(`\b%s\b`, "ch")

	regex := regexp.MustCompile(pattern)
	result := regex.ReplaceAllStringFunc("chácara", func(match string) string {
		trimmedMatch := strings.TrimSpace(match)
		replacement := "replacement"
		return strings.ReplaceAll(match, trimmedMatch, replacement)
	})
	fmt.Println(result)
}

[gabyhelp]

Related Issues and Documentation

• regex: ReplaceAllString and ReplaceAll broken group replacement #65000 (closed)
• regexp.ReplaceAllString is removing the accents of a normalized string #46108 (closed)
• regular expression sub-match not used in replace #42291 (closed)
• regexp: confusing ReplaceAllString result when using patterns like `$1_$2` #68712 (closed)
• Regex: Underscore (_) makes replace group not found #32885 (closed)
• regexp: targetSubString miss match #61465 (closed)
• golang regex replace problem #29936 (closed)
• regexp: wrong match #68281 (closed)
• regexp: In ReplaceAllString, the expand parameter eats the word after it #17469 (closed)
• regexp: compiling incorrectly #59007

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

see https://github.com/google/re2/wiki/Syntax
word boundaries use only ascii

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