I wanted to create a new filter called "pick" which is exactly like regexp,
except that it "picks out" the matched parts instead of finding matching
Motivation behind this is: I have some tiddlers containing links to github
and I wanted to pull out all these links.
As I failed to create a plugin for doing this ad-hoc (too long absence from
tiddlywiki), I shamelessly enhanced regexp to do what I want.
The enhancement is backwards compatible as long as there are no capturing
Pro: Not yet another filter to learn
Cons: Will break current tiddlywikis having capturing groups
Question is: What shall I do with it? Can someone show me how I can create
a plugin so that I can create a "pick" filter? Shall I create a pull
request for the enhanced regexp?
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