Request: Support Node names on Pattern Rules

Make it possible to specify a literal node name, or prefix, or even a regex on the pattern.

This will allow potentially wide reaching (parsys) conversions to only a specified, desired subset of nodes found.

Start by locating the pattern-rule matching entry point and the code that performs parsys conversions. Trace how node names are currently selected, then determine how literal names, prefixes, and regular expressions should narrow the matched nodes. Done means pattern rules can target only the requested node-name subset, with coverage for each matching form.

Written by the indexing model from the issue text.