[Javascript] RegEx for Password w/ spl rules

[AMIT UCHAT]

Hi 
I have been trying to Develop RegEx for a Password authentication with following rules:
1) Must be between 8 - 24 characters
2) Should have atleast 1 digit
3) Should have atleast 1 Alphabatic Character
3) Valid characters are [a-z0-9A-Z at ._]
4) Any Characters cannot repeat more then thrice e.g. Password is "mynaaaame1" is      
   invalid because character 'a' repeated more then thrice consecutively.
 
Rule # 1 is taken care of in password textbox by limiting textbox sixe with min=8 and max=24.
 
Rule # 2 & 3: ^[a-z0-9A-Z at ._]+$
 
Rule # 4: How do I apply it to ^[a-z0-9A-Z at ._]+$ RegEx?
 
Any help/Hints/Direction be much appereciated.
 
Adios,
Amit
 
 
 
 
 
 
 
 

		
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