Here is a regex expression, it doesn't do anything
my $rex = qr/(.)/;
Operators do stuff, here is a regex inside an operator, the substitution operator, replace operator, s///
$captured_and_released =~ s/$rex/$1/;
And match operator, m//atch operator, m//
( $xerox ) = $original =~ m/$rex/;
The tr///ansliteration operator does not use regex expressions
Remember the operator name, its the function that does stuff :)
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