Webflags: g

OpenAPI Path Template

Match OpenAPI / Express-style path templates with `{param}` (or `:param` after substitution) placeholders.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("\\/[\\w\\-]+(?:\\/(?:\\{[\\w\\-]+\\}|[\\w\\-]+))*\\/?", "g");
const input = "GET /users/{id}/posts/{postId}/comments";
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"\/[\w\-]+(?:\/(?:\{[\w\-]+\}|[\w\-]+))*\/?")
input_text = "GET /users/{id}/posts/{postId}/comments"
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(`\/[\w\-]+(?:\/(?:\{[\w\-]+\}|[\w\-]+))*\/?`)
	input := `GET /users/{id}/posts/{postId}/comments`
	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

\/[\w\-]+(?:\/(?:\{[\w\-]+\}|[\w\-]+))*\/?   (flags: g)

Raw source: \/[\w\-]+(?:\/(?:\{[\w\-]+\}|[\w\-]+))*\/?

How it works

\/[\w\-]+ matches the first path segment. The repeating group (?:\/(?:\{[\w\-]+\}|[\w\-]+))* matches subsequent segments — either literal text or a `{param}` placeholder. \/? allows an optional trailing slash. Useful for path-to-handler routing tables.