I assume you mean:

$var = '/aasd/aacscsaa/affr4a/a55gaa/gvgaa/5h aa/fga';
[download]

In that case, you can do one of:

$var =~ s#/aasd##;  # remove '/aasd' 

$var =~ s#/[^/]+##; # remove a slash followed by any number of 
                    # non-slashes

substr($var,0,5,'');# replace the first 5-char substr with ''

$var = substr($var, 5, length($var)-5); # get a substring

$var =~ m#/[^/]+(.*)# and $var = $2; # match what follows 
                                     # after the non-slashes
                                     # and set it to $var
[download]

Hope this helps,,,

Update: Forgot to mention that there are probably a 100 other ways to do this. And thanks jeffa for the correction.