in reply to
How to remove other language character from a string
If what I read is actually your code, you'll need HTML::Entities and a /g modifier to s///:
$ cat test.pl
use 5.14.1;
use warnings;
use HTML::Entities;
my $image;
$image ='ครัวซองเŬ
+8;ซนด์วิชไข$
+56;ดาว Croissant Egg Sandwich ครั
+วซองเเซนด์
+;วิชไข่ดาว';
$image = decode_entities ($image);
$image =~ s/\p{Thai}//g;
print $image;
$ perl test.pl
Croissant Egg Sandwich $
Enjoy, Have FUN! H.Merijn