, the operator
for creating a regexp
. Naturally, it's "pick your own delimiters
", like all the other q's. If you pick the single quote '
as your delimiter
, the insides obey a "single quote" context ($
's and other variable
expanded). Otherwise, it's "double quote" context, just like for the m//
operator. Watch those @
's (and $
Storing the result of qr// in a variable lets you compile the regexp just once (when the qr// is evaluated). This is easier than the old way of compiling an anonymous sub that does the matching for you.
You may also use the result of qr// inside another regular expression:
$digits = qr/\d+/;
$sign = qr/[+-]?/;
$float = qr/$sign $digits