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Re: How to call a function on each item after a split?

by kcott (Abbot)
on Oct 09, 2012 at 09:02 UTC ( #997957=note: print w/ replies, xml ) Need Help??


in reply to How to call a function on each item after a split?

G'day MrSnrub,

I see you have a lot of responses already. Here's my take on this.

You can trim the data by capturing everything that isn't leading or trailing whitespace with this regular expression:

/\A\s*(.*?)\s*\z/

You can use that directly inside a map like this:

say for map { (/\A\s*(.*?)\s*\z/) } split /\|/, $str;

You can use it inside a subroutine called from map like this:

say for map { clean($_) } split /\|/, $str; sub clean { ($_[0] =~ /\A\s*(.*?)\s*\z/)[0] }

It's good that you've tried a variety of cases with whitespace in different positions in your test input $str. What you don't have is leading whitespace at the start of $str or trailing whitespace (following non-whitespace) at the end of $str.

Here's my tests using both of the options I presented with some additional test data.

$ perl -Mstrict -Mwarnings -E ' my $str = " \t item0 with leading whitespace |item1 | item2| item3 | extra item with embedded whitespace \t \n \n\t |item4| | itemN with trailing whitespace \t "; say "---- WITHOUT SUBROUTINE ---"; say ">$_<" for map { (/\A\s*(.*?)\s*\z/) } split /\|/, $str; say "---- USING SUBROUTINE ---"; say "<$_>" for map { clean($_) } split /\|/, $str; sub clean { ($_[0] =~ /\A\s*(.*?)\s*\z/)[0] } ' ---- WITHOUT SUBROUTINE --- >item0 with leading whitespace< >item1< >item2< >item3< >extra item with embedded whitespace< >item4< >< >itemN with trailing whitespace< ---- USING SUBROUTINE --- <item0 with leading whitespace> <item1> <item2> <item3> <extra item with embedded whitespace> <item4> <> <itemN with trailing whitespace>

-- Ken


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