24-Hour Time

const re = new RegExp("(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d)?", "g");
const input = "14:30";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

import re

pattern = re.compile(r"(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d)?")
input_text = "14:30"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d)?`)
	input := `14:30`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}