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feature: regexp: support pattern '\1' #42549

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eraac opened this issue Nov 12, 2020 · 2 comments
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feature: regexp: support pattern '\1' #42549

eraac opened this issue Nov 12, 2020 · 2 comments
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@eraac
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eraac commented Nov 12, 2020

Add the possibility to use the contents in capture in a regex with the pattern \1

These kinds of regex doesn't work (\d+):\1; \1 should be equal to the content of the first capture \d+

# https://play.golang.org/p/6jLRaiw2-BC
panic: regexp: Compile(`(\d+):\1`): error parsing regexp: invalid escape sequence: `\1`

This will be useful for some app who use the package regexp (ex. prometheus)
@mvdan
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mvdan commented Nov 12, 2020

See previous questions, like https://stackoverflow.com/questions/23968992/how-to-match-a-regex-with-backreference-in-go.

@ianlancetaylor
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This is working as designed, sorry. See the discussion at https://swtch.com/~rsc/regexp/.

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@ianlancetaylor @mvdan @eraac @gopherbot