Chas. Owens wrote:
w? And why?
snip
how:
my $pattern = '.*(?:' . join('|', map quotemeta, @ARGV) . ')';
$pattern = qr/$pattern/;
why:
To compile the regex. In the original program, the regexes use the o
modifier to promise that $pattern won't change so the optimizer can
compile the regexes once, but if you use qr// then you don't have to
make that promise and you still only compile the regex once.
thanks Chas, I have cheat sheet on my monitor and I only had qr as
regex, I am making a note on the fact that it actually compile only once
regex and
should not be used at all time to do regex build.
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