Accessing matches in regular expression globbing

[yohan-pg]

In regular expression globbing (or even in regular globbing), it would be nice if we could access the Match object (https://docs.python.org/3/library/re.html#match-objects) corresponding to each resulting match.

For example, replacing this:

for filepath in `data/(.*)/(.*)/.*\.png`:
    match = re.match(r'data/(.*)/(.*)/.*\.png', filepath)
    dir1, dir2 = match.groups() 

with something like:

for match in m`data/(.*)/(.*)/.*\.png`:
    dir1, dir2 = match.groups() 

For community

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[anki-code]

hey! Nice feature. And I believe that it's possible to implement this with backward compatibility i.e. .* and (.*) work as now but (.*)/(.*) returns pairs. It will be cool to make this shorter:

for dir1, dir2, file in `data/(.*)/(.*)/.*\.png`:
    pass

The start point to implement this:

xonsh/xonsh/parsers/base.py

Line 634 in e03bda4

def xonsh_pathsearch(self, pattern, pymode=False, lineno=None, col=None):

PR is welcome! (It will be cool to fix this by the way - #3372)

[yohan-pg]

Sweet! I really like the idea of having it be backwards compatible. I'll try to have a look it at implementing this, although it might be in a long time.