// Bitmap used by func special to check whether a character needs to be escaped.
var specialBytes [16]byte

// special reports whether byte b needs to be escaped by QuoteMeta.
func special(b byte) bool {
	return b < utf8.RuneSelf && specialBytes[b%16]&(1<<(b/16)) != 0
}

func init() {
	for _, b := range []byte(`\.+*?()|[]{}^$`) {
		specialBytes[b%16] |= 1 << (b / 16)
	}
}