page.route() silently aborts navigation when glob contains unbalanced { or }

[007bsd]

Description

When a glob pattern with unbalanced { or } is passed to page.route(), the internal
globToRegexPattern() emits an unterminated regex group. When a real HTTP request is made,
new RegExp(pattern) throws SyntaxError: Invalid regular expression inside the route
matcher — silently aborting the request. The page never loads and navigation times out with
net::ERR_ABORTED.

Minimal repro

import { test } from "@playwright/test";
import { createServer } from "http";

test("unbalanced brace in route glob aborts navigation", async ({ page }) => {
  const server = createServer((_, res) => res.end("hi"));
  server.listen(0);
  const port = (server.address() as any).port;
  await page.route("http://*/foo{", route => route.continue());
  await page.goto("http://localhost:" + port + "/"); // hangs, then ERR_ABORTED
});

Other patterns that trigger this

Glob	Emitted regex	Error
"{foo"	/^(foo$/	Unterminated group
"}foo"	/^)foo$/	Unmatched ')'
"**/*.png?{"	/^(.*/)([^/]*)\.png\?($/	Unterminated group
"https://example.com/{a"	/^https://example\.com/(a$/	Unterminated group

Root cause

packages/isomorphic/urlMatch.ts lines 58–65: case '{' unconditionally emits ( and
case '}' unconditionally emits ) with no balance check. An unmatched brace produces
an invalid regex that throws SyntaxError at request-match time.

Expected behavior

Either validate the glob early and throw a descriptive error (Invalid glob pattern: unbalanced '{'),
or treat unbalanced braces as literals (like most glob libraries do).

Environment

• Playwright version: 1.59.1
• OS: Linux (Ubuntu on WSL2)
• Node.js: v22.11.0