• It makes no sense to let the user specify /g for a match. You can't even use it on qr// because it makes no sense. ixsm are the four modifiers that apply to the pattern as opposed to the operator.

• The followign doesn't make much sense:

  my $compd_pattern = eval "qr($pattern)" or die $@;
  [download]

  It removes the ability of qr// to quote, which is what you want. The code should be

  my $compd_pattern = qr($pattern);
  [download]

• You say you have problems doing substitutions, but you didn't show us your attempt (despite your claim). You should have no problems using a qr// pattern in a substitution.

my $pat  = ...;
my $repl = ...;

my $mods = '';
$mods .= 'i' if ...;
$mods .= 's' if ...;
$mods .= 'm' if ...;
$mods .= 'x' if ...;

my $re = qr/(?$mods:$pat)/;

if (...) {
    s/$re/$repl/g;
} else {
    s/$re/$repl/;
}
[download]

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