Chas Owens wrote:
qr// is just a fancy double
quote that adds a non-capturing group and sets the appropriate options
(in case you did something like qr/foo/i). The string "(?:-xism:foo)"
is no more or less a regex than the string "foo".
Let's look into that.
C:\home>type test.pl
$re1 = '(?i-xsm:foo)';
$re2 = qr(foo)i;
foreach ($re1, $re2) {
print $_, "\n";
if ( $ret = ref $_ ) {
print "Scalar variabel type: $ret\n\n";
} else {
print "Scalar variabel type: plain string\n\n";
}
}
C:\home>perl test.pl
(?i-xsm:foo)
Scalar variabel type: plain string
(?i-xsm:foo)
Scalar variabel type: Regexp
C:\home>
Apparently there is more into it; maybe it has something to do with qr//
compiling the string that is passed to the operator.
http://perldoc.perl.org/perlop.html#qr%2fSTRING%2fimosx-qr-%2fi-%2fm-%2fo-%2fs-%2fx
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Gunnar Hjalmarsson
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