Re: efficiently extracting a capture group from analy

On Sat, Jun 04, 2022 at 12:22:49PM -0400, Graydon Saunders scripsit:
> I would recommend against trying to do this with general application of
> a single regular expression.

and I still would, but now I've read your question a little slower and
you want the bit after the dash but before the suffix.

file:name($file) => replace('my-','') => replace('.xml','')

but this gives me the flinch because I don't necessarily trust file
names to be consistent.  You could add 'i' to the replace, or

file:name($file) => tokenize('[\.-]')[not(matches(.,'my','i') or
matches(.,'xml','i'))]

Might be a little more robust against future change since you can add
individual tests to the predicate.

For real it could be

file:name($file) => tokenize('[\.-]') ! local:wantedFileNamePart(.)

where local:wantedFileNamePart() knows the rules for what parts to keep.

This gives you the opportunity to deal with the file names you have to
put back together if there's inconsistency in the pattern such as
"my-long-name.xml".

-- 
Graydon Saunders  | graydonish@xxxxxxxxx
^fs oferiode, pisses swa mfg.
-- Deor  ("That passed, so may this.")