How do I identify that the string has been matched $ already? Note this example: 
my $str = "abc";
while ($str =~ m/.|$/gc) {
    printf("1: %d\n", pos($str));
}
while ($str =~ m/.|$/gc) {
    printf("2: %d\n", pos($str));
}

Output:
1: 1
1: 2
1: 3
1: 3

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The second loop matches nothing - I want this, but more importantly, I'd like something that can tell me that the regex engine has matched $ already. pos is set to 3 for each of those matches, so what other function can tell me that a string has already matched $? I need to use gc as I don't want a non-match to reset pos().

In reply to perl indication of end of string already matched by nachumk

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