File & Path

Relative Path

Matches relative file paths (./, ../, or path/to/file).

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("^(\\.{1,2}\\/)?([^\\/\\0]+\\/)*[^\\/\\0]+$", "");
const input = "./src/index.ts";
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"^(\.{1,2}\/)?([^\/\0]+\/)*[^\/\0]+$")
input_text = "./src/index.ts"
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(`^(\.{1,2}\/)?([^\/\0]+\/)*[^\/\0]+$`)
	input := `./src/index.ts`
	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

^(\.{1,2}\/)?([^\/\0]+\/)*[^\/\0]+$

Raw source: ^(\.{1,2}\/)?([^\/\0]+\/)*[^\/\0]+$

How it works

`^(\.{1,2}\/)?` optionally matches `./` or `../` prefix. `([^\/\0]+\/)*` matches zero or more directory segments. `[^\/\0]+$` matches the final file segment.