continue
				}
			}
			newSQL.WriteByte(v)
		}

		sql = newSQL.String()
	} else {
		sql = numericPlaceholder.ReplaceAllString(sql, "$$$1$$")

		sql = numericPlaceholderRe.ReplaceAllStringFunc(sql, func(v string) string {
			num := v[1 : len(v)-1]
			n, _ := strconv.Atoi(num)

			// position var start from 1 ($1, $2)
			n -= 1
			if n >= 0 && n <= len(vars)-1 {
				return vars[n]
			}

pkg regexp, method (*Regexp) ReplaceAllLiteralString(string, string) string
pkg regexp, method (*Regexp) ReplaceAllString(string, string) string
pkg regexp, method (*Regexp) ReplaceAllStringFunc(string, func(string) string) string
pkg regexp, method (*Regexp) String() string
pkg regexp, method (*Regexp) SubexpNames() []string
pkg regexp, type Regexp struct
pkg regexp/syntax, const ClassNL Flags