File & Path

Hidden File (Dotfile)

Matches Unix-style hidden files (dotfiles) like .gitignore or .env.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("^\\.[^.\\s/\\\\][^/\\\\]*$", "");
const input = ".gitignore";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

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

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

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

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

^\.[^.\s/\\][^/\\]*$

Raw source: ^\.[^.\s/\\][^/\\]*$

How it works

`^\.` requires leading dot. `[^.\s/\\]` requires the next character to not be another dot, whitespace, or slash. `[^/\\]*$` allows any additional non-slash characters.