In JavaScript, you can create functions to validate and restrict user input to a specific language.

Just Add Class 'eng_only' to input for enforcing accept English letters ,
and add Class 'arb_only' to input for enforcing accept Arabic letters

JS Code

 <script>
            $(document).ready(function (){
                $(".eng_only").keypress(function(event){
                    var ew = event.which;
                    if(ew == 32)
                        return true;
                    if(48 <= ew && ew <= 57)
                        return true;
                    if(65 <= ew && ew <= 90)
                        return true;
                    if(97 <= ew && ew <= 122)
                        return true;
                    return false;
                });
                $(".arb_only").keypress(function(event){
                    var inputValue = $(this).val();
                    var validChars = /^[\u0600-\u06FF\s]+$/;
                    if (!validChars.test(inputValue)) 
                    {
                        // Remove invalid characters
                        $(this).val(inputValue.replace(/[^\u0600-\u06FF\s]+/g, ''));
                        

                }
            });
        })
    </script>

HTML Code

<input type='text' class='eng_only'>

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