regex - Regular Expression function for maximum 15 characters -

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i need regular expression reference number entered user takes maximum of 15 characters (numbers , letters only). how best implement this? here have tried date. 

private static final string my_account_number = ("[^a-za-z0-9]"); 

^[a-za-z0-9]{1,15}$

^: start of string, followed by...

[a-za-z0-9]: ...any alphanumeric character...

{1,15}: ...1 15 times, followed by...

$: ...the end of string.


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