func regexp/syntax.cleanAlt

4 uses

	regexp/syntax (current package)
		parse.go#L510: 		cleanAlt(subs[len(subs)-1])
		parse.go#L523: func cleanAlt(re *Regexp) {
		parse.go#L750: 			cleanAlt(sub[start])
		parse.go#L1400: 				cleanAlt(p.stack[n-3])