regexp.Regexp.prefixRune (field)

3 uses

	regexp (current package)
		exec.go#L207: 			if len(m.re.prefix) > 0 && r1 != m.re.prefixRune && i.canCheckPrefix() {
		regexp.go#L93: 	prefixRune     rune           // first rune in prefix
		regexp.go#L209: 		regexp.prefixRune, _ = utf8.DecodeRuneInString(regexp.prefix)