Re^3: Capturing regex from map

You are right, grep will not do captures in such a situation. I might not have been clear, but I only mentionned is as an additional useful tool in similar synctactic context, for filtering purpose.

Having said that you can do something akin to captures in a grep, although it is not very clean. Consider this:

  DB<1> @a = qw (foobar barfoo foobaz, bar, foobor);

  DB<2> @c = grep {s/fo(ob.).+/$1/} @a;

  DB<3> x @c
0  'oba'
1  'oba'
2  'obo'
[download]

Not clean, I would not really recommend it, but not impossible.

Comment on Re^3: Capturing regex from map Download Code

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Re^4: Capturing regex from map by AnomalousMonk (Archbishop) on Sep 14, 2013 at 10:30 UTC
Not clean ... ... in part, perhaps, because the `@a` input array is affected (via aliasing) and winds up 'oba-oba-obo-ed': `>perl -wMstrict -le "my @a = qw(foobar barfoo foobaz bar foobor); my @c = grep {s/fo(ob.).+/$1/} @a; ;; printf qq{'$_' } for @c; print qq{\n}; printf qq{'$_' } for @a; " 'oba' 'oba' 'obo' 'oba' 'barfoo' 'oba' 'bar' 'obo'` [download]	[reply] [d/l] [select]
Re^5: Capturing regex from map by Laurent_R (Canon) on Sep 14, 2013 at 13:40 UTC
Yes, you are absolutely right, this is definitely one of the main reasons why it is not clean in my mind (and I upvoted your comment). But you can also make a temporary copy if you want to keep the original array intact, no big deal if the data is nor too large. But again, I am not suggesting this as a good solution. It might just be a possible useful alternative in some edge cases or very specific context, although I fail to see any.	[reply]


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