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Re^4: trim leading & trailing whitespace

by tlm (Prior)
on Mar 30, 2005 at 10:41 UTC ( #443402=note: print w/ replies, xml ) Need Help??


in reply to Re^3: trim leading & trailing whitespace
in thread trim leading & trailing whitespace

How about this:

$_ = " yes \n \n \n they \n \n will \n\n\n"; s/^\s*?(?:\b(.*?)\s*?)?(\n)?$/$1$2/gm; print; __END__ % perl 443391.pl yes they will

the lowliest monk


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Re^5: trim leading & trailing whitespace
by bart (Canon) on Mar 30, 2005 at 11:10 UTC
    Danger, don't use \b if you want to detect the edges between spaces an nonspaces. It won't work for nonspace+nonword characters, like quotes and punctuation.

    Perhaps replace the \b(.*?) with (\S.*?).

    Still, you're not running this with warnings enabled, are you? Both $1 and $2 are optional, so both can be undef, but you use their value regardless. This runs without warnings:

    s/^\s*?((?:\S.*?)?)\s*?(\n?)$/$1$2/gm;

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