I recommend starting with the regex(7) man page, before comparing any implementation to another.

But, iirc vis regex are different from Guile's
I might be wrong on that.

‘By default, Guile supports POSIX extended regular expressions.’ — (guile)Regexp Functions

‘[vis] uses what POSIX refers to as “Extended Regular Expressions”’ — vis(1)

Kind regards,

T G-R

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