Regex in params extract extra characters with any capturing groups

[spsquared]

Reproduction

https://codesandbox.io/p/sandbox/vue-router-params-regex-bug-kdcvvs

Steps to reproduce the bug

1. Create a router with a route that contains any regexp with capturing groups within it (like (.))
2. Error as the regexp extracts the parenthesis from the route syntax

Expected behavior

The router extracts the regexp from inside the parenthesis and uses (.) as its regexp.

Actual behavior

An error occurs as the syntax is included as part of the extracted regexp.

Additional information

(.) is a fairly dumb expression but (a[abc])+ also breaks it.

[posva]

the () is already a regex group and the ) marks the end. Therefore you need to escape the closing ): https://paths.esm.dev/?p=AAMsIPQgYAEL9lNgQAECUgPgDIFoDiiAwA5sbTACwBgAXQR0GqDkngCA&t=/abacac#. Note in JS strings, you need to escape the \ too