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Re^2: Is there a more functional regex syntax?

by kennethk (Monsignor)
on Sep 18, 2012 at 16:56 UTC ( #994314=note: print w/ replies, xml ) Need Help??


in reply to Re: Is there a more functional regex syntax?
in thread Is there a more functional regex syntax?

Or, as an improvement in the regex, /^(?=(\d+))(?:\d+-)?(\d+)$/, so that both $1 and $2 are always defined. So, as 1 line,

$totals[$_] += ($range =~ /^(?=(\d+))(?:\d+-)?(\d+)$/)[$_] for 0,1;
Or more simply, if you want to keep the variables separate,
$total_min += ($range =~ /^(\d+)/)[0]; $total_max += ($range =~ /(\d+)$/)[0];

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.


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Re^3: Is there a more functional regex syntax?
by smls (Friar) on Sep 18, 2012 at 17:14 UTC

    Thank, this is what I've been looking for!

    It's not extremely pretty, but it should scale nicely for the general case of needing the result of a regex string extraction as a right-hand-side value.

    PS: The regex suggested by tobyink above can make the single-line case much more readable: /(\d+)/g

      The regex suggested by tobyink above can make the single-line case much more readable

      The advantage of mine is that it actually enforces format, which may or may not be of concern. I also like that you expect two values and you get two values; a little less slight of hand for maintenance. But I do appreciate the elegance of his choice of indices.

      Also be aware you'll need to initialize @totals = (0,0) so that the index -1 doesn't map to your first term. tobyink does it, but didn't really emphasize its importance.


      #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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