Using the dialectic is another way to deal with this.
# Prints 'First: A', as you expect
'abcd' =~ /(a)/;
print "First: ", uc $1, "\n";
# Also prints 'Second: A', though you expect it not to
'efgh' =~ /(a)/;
print "Second: ", uc $1, "\n";
# Prints 'Third: A' - again, as you expect
'abcd' =~ /(a)/ and print "Third: ", uc $1, "\n";
# Doesn't print anything - what you want
'efgh' =~ /(a)/ and print "Fourth: ", uc $1, "\n";
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