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1 =~ /1/; 
for (my $i = 3; $i =~ /[34]/; $i++) {
    print $&; 
}
print $&;

Select or download this

1 =~ /1/; 
for ((my $i = 3) =~ /./; $i =~ /[34]/; $i++) {
    print $&; 
}
print $&;