Here's my shot at it:
use strict;
my @list=('xxxxxa : yyyyy blah blah','xxxxxb : yyyyy blah blah',' ',
+'xxxxxc : yyyyy blah blah',': this is strange','xxxxxd : yyyyy blah b
+lah',"\n",'xxxxxe : yyyyy blah blah');
my @result = map {m/(.*?)\s+:/} @list;
print join("\n",@result);
It throws out blank lines, lines with only a trailing newline and lines which start with a colon. The operative part counts 24 characters. CountZero
Update:Added ? to make the match non-greedy (see blokhead's remarks)
Update 2:The operative part could be written as map/(.*?)\s+:/,@list and is then only 20 characters long.
"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law
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