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regular expression sub-match not used in replace #42291

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xrfang opened this issue Oct 30, 2020 · 1 comment
Closed

regular expression sub-match not used in replace #42291

xrfang opened this issue Oct 30, 2020 · 1 comment
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@xrfang
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xrfang commented Oct 30, 2020 •
edited

What version of Go are you using (go version)?

$ go version

go version go1.15 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env

GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/home/xrfang/.cache/go-build"

GOENV="/home/xrfang/.config/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOINSECURE="git2.likeit.cn"

GOMODCACHE="/home/xrfang/go/pkg/mod"

GONOPROXY="git2.likeit.cn"

GONOSUMDB="git2.likeit.cn"

GOOS="linux"

GOPATH="/home/xrfang/go"

GOPRIVATE="git2.likeit.cn"

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/usr/local/go"

GOSUMDB="off"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"

GCCGO="gccgo"

AR="ar"

CC="gcc"

CXX="g++"

CGO_ENABLED="1"

GOMOD=""

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build285451013=/tmp/go-build -gno-record-gcc-switches"

What did you do?

package main

import (
	"fmt"
	"regexp"
)

func main() {
	s := `</OCR_RVCT3>
	<OCR_RVCT4>
	  <Type>1</Type>
	  <StartAddress>0x8008000</StartAddress>
	  <Size>0x38000</Size>
	</OCR_RVCT4>
	<OCR_RVCT5>`
	rx := regexp.MustCompile(`(?s)(<OCR_RVCT4>.*?<StartAddress>)(.+?</StartAddress>)`)
	s = rx.ReplaceAllString(s, `$1TEST</StartAddress>`)
	fmt.Println(s)
}

What did you expect to see?

</OCR_RVCT3>
	<OCR_RVCT4>
	  <Type>1</Type>
	  <StartAddress>TEST</StartAddress>
	  <Size>0x38000</Size>
	</OCR_RVCT4>
	<OCR_RVCT5>

What did you see instead?

</OCR_RVCT3>
        </StartAddress>
          <Size>0x38000</Size>
        </OCR_RVCT4>
        <OCR_RVCT5>
@seankhliao
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use ${1}, see the examples for ReplaceAllString

questions should be directed to the forums in https://github.com/golang/go/wiki/Questions

@xrfang xrfang closed this as completed Oct 30, 2020
@golang golang locked and limited conversation to collaborators Oct 30, 2021
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@xrfang @gopherbot @seankhliao