Function routeCapture

Extracts captured fragments from the route match.

• Extracts named captures under their names as keys.
• Extracts anonymous captures under $N key, there N is capture index.
• Extracts dirs as string representations of extracted path.
• Extracts regexp match groups in addition to the match itself under under <capture_name>$<group_index> (for named capture), or <capture_index>$<group_index> for anonymous capture.
• Extracts named regexp match groups under their names as keys.