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regexp: LiteralPrefix returns complete=true incorrectly #11175

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dvyukov opened this issue Jun 11, 2015 · 2 comments
Closed

regexp: LiteralPrefix returns complete=true incorrectly #11175

dvyukov opened this issue Jun 11, 2015 · 2 comments
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Go1.6

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@dvyukov
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dvyukov commented Jun 11, 2015

The following program fails:

package main

import "regexp"

func main() {
    re := regexp.MustCompile("^0^000000$")
    prefix, complete := re.LiteralPrefix()
    if complete && !re.MatchString(prefix) {
        panic("prefix:" + prefix)
    }
}
panic: prefix:0

If LiteralPrefix return complete==true, the re must match the prefix.

go version devel +b0532a9 Mon Jun 8 05:13:15 2015 +0000 linux/amd64
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Jun 11, 2015
@rsc rsc changed the title regexp: LiteralPrefix lies about completeness (2) regexp: LiteralPrefix returns complete=true incorrectly Oct 14, 2015
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rsc commented Oct 14, 2015

This one is a real problem.

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CL https://golang.org/cl/16200 mentions this issue.

@rsc rsc closed this as completed in d1eedfe Nov 25, 2015
@golang golang locked and limited conversation to collaborators Nov 27, 2016
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