Mass edit journal entries based on a filter

Just starting to get into PTA and so far very happy with it. I imported a few years of my bank statements, added a few rules in for hledger to generate some nice journals that balance well but of course I still ended up with a bunch of expense:unknown entries that I'm cleaning up manually.

Is there an existing tool that will allow me to set the second account of an entry for all entries that match a given filter (payee, description, etc). It's not hard to do but I'm sure I must exist already and I'm just missing it.

Thanks!

submitted by /u/ternagen
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This is a companion discussion topic for the original entry at https://www.reddit.com/r/plaintextaccounting/comments/1auyf0k/mass_edit_journal_entries_based_on_a_filter/