Hidden File (Dotfile)

const re = new RegExp("^\\.[^.\\s/\\\\][^/\\\\]*$", "");
const input = ".gitignore";
const match = input.match(re);
console.log(match ? match[0] : null);

import re

pattern = re.compile(r"^\.[^.\s/\\][^/\\]*$")
input_text = ".gitignore"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^\.[^.\s/\\][^/\\]*$`)
	input := `.gitignore`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}