Video File Extension

const re = new RegExp("\\.(mp4|mov|avi|mkv|webm|m4v|flv|wmv|mpg|mpeg)$", "i");
const input = "movie.mp4";
const match = input.match(re);
console.log(match ? match[0] : null);

import re

pattern = re.compile(r"\.(mp4|mov|avi|mkv|webm|m4v|flv|wmv|mpg|mpeg)$", re.IGNORECASE)
input_text = "movie.mp4"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`(?i)\.(mp4|mov|avi|mkv|webm|m4v|flv|wmv|mpg|mpeg)$`)
	input := `movie.mp4`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}