I'm trying to convert this ruby regex to go.
GROUP_CALL = /^(?<i1>[ \t]*)group\(?[ \t]*(?<grps>#{SYMBOLS})[ \t]*\)?[ \t]+do[ \t]*?
(?<blk>.*?)
^\k<i1>end[ \t]*$/m
I converted it to
groupCall := regexp.MustCompile("^(?P<i1>[ \\t]*)group\\(?[ \\t]*(?P<grps>(?::\\w+|:\"[^\"#]+\"|:'[^']+')([ \\t]*,[ \\t]*(?::\\w+|:\"[^\"#]+\"|:'[^']+'))*)[ \\t]*\\)?[ \\t]+do[ \\t]*?\
(?P<blk>.*?)\
^\\k<i1>end[ \\t]*$/s")
but when run I get this error
error parsing regexp: invalid escape sequence: \k
There's no mention of \k in the go docs, is there no equivalent in go?
lookbehinds aren't supported neither are backreferences like @stribizhev mentioned.
Regular Expression 2 (RE2) Syntax Reference:
https://github.com/google/re2/wiki/Syntax
The syntax of the regular expressions accepted is the same general syntax used by Perl, Python, and other languages. More precisely, it is the syntax accepted by RE2 and described at //code.google.com/p/re2/wiki/Syntax, except for \C. --GoLang Docs
(ref: https://golang.org/pkg/regexp/)