No loops and just one regular expressioon:
use Modern::Perl '2014';
my $first = qr/STRING/;
my $second = qr/MAGIC/;
my $corpus = join '', map { chomp; $_ } <DATA>;
if ( $corpus =~ m/($first)(?!.*$first).*($second)(?!.*$first)/ ) {
say "Success: $-[1] and $-[2]";
}
else {
say "Failure";
}
__DATA__
First line
second line
here is the STRING
empty text
the STRING again!
followed by the MAGIC word
more emptiness
Oh no! the first STRING again
sadness
did we look in vain?
Yes, It's like MAGIC
we are happy
Ah, STRING and MAGIC success
MAGIC and STRING failed
Fiddle around with the
DATA-section to check the various possibilities and combiinations.
CountZero
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
My blog:
Imperial Deltronics
