Cron Expression

const re = new RegExp("^(\\*|([0-5]?\\d))\\s+(\\*|([01]?\\d|2[0-3]))\\s+(\\*|([1-9]|[12]\\d|3[01]))\\s+(\\*|([1-9]|1[0-2]))\\s+(\\*|[0-7])$", "");
const input = "0 9 * * 1";
const match = input.match(re);
console.log(match ? match[0] : null);

import re

pattern = re.compile(r"^(\*|([0-5]?\d))\s+(\*|([01]?\d|2[0-3]))\s+(\*|([1-9]|[12]\d|3[01]))\s+(\*|([1-9]|1[0-2]))\s+(\*|[0-7])$")
input_text = "0 9 * * 1"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^(\*|([0-5]?\d))\s+(\*|([01]?\d|2[0-3]))\s+(\*|([1-9]|[12]\d|3[01]))\s+(\*|([1-9]|1[0-2]))\s+(\*|[0-7])$`)
	input := `0 9 * * 1`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}