Regarding the first point, converting the case of a string using a regex is the hard way, just use uc or lc. To ignore case in a regex use the 'i' modifier.

To the second point, what you want is to capture characters that appear at a certain place in the string, and you can do this using parentheses. For example:

$aturl =~ /^http:\/\/$myuser(.*)$/i; # capture everything after the do
+main
$match = $1; # assign the captured stuff to a new variable.
[download]

See perlre for more explanation.

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"The dead do not recognize context" -- Kai, Lexx