How to determine a string is english or arabic?

Question

Is there a way to determine a string is English or Arabic?

Answer 1

You can usually tell by the code points within the string itself. Arabic occupies certain blocks in the Unicode code space.

It's a fairly safe bet that, if a substantial proportion of the characters exist in those blocks (such as بلدي الحوامات مليء الثعابينة), it's Arabic text.