use strict;

sub make_regex_list{
  my @regexes;
  foreach my $strings (@_) {
    my($regex_string,$options)=@$strings;
    push @regexes,qr/(?$options)$regex_string/;
  }
  return @regexes;
}

my $string = "Jack Jack John";
# in real code this array would be constructed 
# from a file
my @reStrings=(["jack","ig"],["john","i"]);
my @REGEXES=make_regex_list(@reStrings);
foreach my $regex (@REGEXES) {
  $string=~s/$regex/name/;
}
print $string."\n";


##</code><code>##

"name Jack name"