And to support your point, an invariant string inside double-quotes gets compiled down to a single quoted string. Any time wasted is not wasted at run-time.

$cat print.pl
print 'Hello';
print "Hello";    # compiles to 'Hello'
print "Hello $_";

$perl -MO=Deparse print.pl
print 'Hello';
print 'Hello';
print "Hello $_";
print.pl syntax OK

[download]

5.005_03, 5.6.1 and 5.8.4 produce identical results.

In reply to Re^3: You don't always have to use regexes by bmann
in thread You don't always have to use regexes by petdance

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