Re^3: Removing empty line(s) with regex in a multiple strings in a variable

A good place to start is with the perlre documentation. It is fairly extensive, but is likely to be much more useful to you in the long run than me decomposing the expression I gave above. Note that there is a very useful "See Also" section at the bottom of the documentation - in fact you might want to check that out first. There is a trick that may help you break the regex down into easier to understand parts though:

$str =~ s/
    (^|\n)
    [\n\s]*
    /$1/gx;
[download]

The x switch ignores white space (including new lines) so we can use white space to break up the parts of the regex into units.

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

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