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How validate username using regexp ?
For English letters, Numbers and spaces I am using :
/^[a-zA-Z]{1}([a-zA-Z0-9]|\s(?!\s)){4,14}[^\s]$/
How can i add arabic letters ?
Well that would depend if your characters are coming in as cp1256 or unicode. If its unicode you can use the range such as #([\x{0600}-\x{06FF}]+\s*) in your expression.