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how touse RegularExpression("^[0-9]\\d*(\\.\\d{1,2})?$") MVC

how touse RegularExpression("^[0-9]\\d*(\\.\\d{1,2})?$") MVC?
 
 what is this \\d* meaning
 
 ex:
 ("^[0-9]\\d*(\\.\\d{1,2})?$")

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