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Re: $1, etc. are not just strings

by ikegami (Pope)
on Jan 04, 2007 at 16:49 UTC ( #592985=note: print w/ replies, xml ) Need Help??

in reply to $1, etc. are not just strings

That reminds me of the danger of passing a var to a function that modifies that var. It's particularly easy to screw up when dealing with built-in globals variables such as $1.

sub func { 'b' =~ /(.)/; print(@_, "\n"); } 'a' =~ /(.)/; func($1); # Prints "b" 'a' =~ /(.)/; func("$1"); # Prints "a"
sub func { eval { die "bar\n" }; print(@_); } eval { die "foo\n" }; func($@); # Prints "bar" eval { die "foo\n" }; func("$@"); # Prints "foo"

(If you want to mess with your mind, try removing the second 'a' =~ /(.)/; from the first snippet.)

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