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regexp: matching when shouldn't match #59199

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mniak opened this issue Mar 23, 2023 · 1 comment
Closed

regexp: matching when shouldn't match #59199

mniak opened this issue Mar 23, 2023 · 1 comment
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@mniak
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mniak commented Mar 23, 2023 •
edited

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

$ go version
go version go1.20.2 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/user/.cache/go-build"

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

GOEXE=""

GOEXPERIMENT=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOINSECURE=""

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

GONOPROXY=""

GONOSUMDB=""

GOOS="linux"

GOPATH="/home/user/go"

GOPRIVATE=""

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

GOROOT="/usr/lib/go"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

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

GOVCS=""

GOVERSION="go1.20.2"

GCCGO="gccgo"

GOAMD64="v1"

AR="ar"

CC="gcc"

CXX="g++"

CGO_ENABLED="1"

GOMOD="/home/user/myproject/go.mod"

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 -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build974827674=/tmp/go-build -gno-record-gcc-switches"

What did you do?

package main

import (
	"fmt"
	"regexp"
)

func main() {
	input := "carbon"
	re := regexp.MustCompile(`^car|train$`)

	isMatch := re.MatchString(input)
	match := re.FindString(input)

	fmt.Println("Matches?", isMatch)
	fmt.Println("Match:", match)
}

https://go.dev/play/p/9NhCzJXUz42

What did you expect to see?

It sould not match because this have a caret and a dollar sign, meaning that it should expect it to be an exact match.

Matches? false
Match:

What did you see instead?

Matches? true
Match: car
@mniak
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mniak commented Mar 23, 2023

My bad: I should use ^(car|train)$ instead

@mniak mniak closed this as completed Mar 23, 2023
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