I'm not half-bad at regular expressions, but I'm not sure I want to begin reverse engineering:
```
getSOAnswerIdFfromURLRegExes = [
/(?:^|[\s"(])(?:(?:https?:)?(?:(?:\/\/)?(?:www\.|\/\/)?stackoverflow\.com\/))(?:a[^\/]*)\/+(\d+)(?:\s*|\/[^/#]*\/?\d*\s*)(?:$|[\s")])/g, // eslint-disable-line no-useless-escape
/(?:^|[\s"'(])(?:(?:https?:)?(?:(?:\/\/)?(?:www\.|\/\/)?stackoverflow\.com\/))(?:q[^\/]*|posts)[^\s#]*#(\d+)(?:$|[\s"')])/g, // eslint-disable-line no-useless-escape
];
```