Did you run the code the OP posted? Since at least 5.6.1, the $1 set by the regexp inside the if is no longer in scope outside the if. The following illustrates this clearly.
'a' =~ /(.)/;
{
'b' =~ /(.)/;
print("$1\n"); # b
}
print("$1\n"); # a
This is documented in perlvar.
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