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Re: syntax question

by keszler (Priest)
on Oct 23, 2013 at 20:14 UTC ( #1059344=note: print w/ replies, xml ) Need Help??


in reply to syntax question

Assuming that you're in some loop and the next command is how you "exclude a field ending in X", you have the right idea. The parentheses around the regular expression are not needed. I would usually write that as next if $fld0 =~ /X$/;, but if ($fld0 =~ /X$/) { next; } is effectively the same.

Another option: next if substr($fld0,-1,1) eq "X"; (substr)


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Re^2: syntax question
by QM (Vicar) on Oct 24, 2013 at 08:35 UTC
    Update: Sorry, I should have read the thread first, toolic said the same thing.

    next if substr($fld0,-1,1) eq "X";

    is not exactly equivalent to

    next if $fld0 =~ /X$/;

    since $ at the end of a regex is a bit special. From perlre #Metacharacters:

    $ Match the end of the line (or before newline at the end)

    -QM
    --
    Quantum Mechanics: The dreams stuff is made of

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