Regex - Alpha-numeric

Letters and Numbers only

^[A-Za-z0-9]+$

Letters and Numbers only (Maximum 3-10 in length)

^[A-Za-z0-9]{3,10}$

Letters, numbers and Chinese characters

^[\u4E00-\u9FA5A-Za-z0-9]+$

Letters, numbers and Chinese characters (2-5 in length)

^[\u4E00-\u9FA5A-Za-z0-9]{2,5}$