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Add query to find number of subexpressions.

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This was convenient for me to have without being forced
to parse the regexp myself. I'd understand if it's not
really wanted, but I also think that some meta information
about compiled regexps would be fine.

R=r, rsc
CC=golang-dev
https://golang.org/cl/183044
This commit is contained in:
Peter Froehlich 2009-12-24 08:43:35 +11:00 • committed by Rob Pike
parent b266f39b85
commit e1033d07b4
2 changed files with 31 additions and 0 deletions
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3
src/pkg/regexp/regexp.go
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@ -677,6 +677,9 @@ func MustCompile(str string) *Regexp {
return regexp
}
// NumSubexp returns the number of parenthesized subexpressions in this Regexp.
func (re *Regexp) NumSubexp() int { return re.nbra }
// The match arena allows us to reduce the garbage generated by tossing
// match vectors away as we execute. Matches are ref counted and returned
// to a free list when no longer active. Increases a simple benchmark by 22X.