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lincylincy 

validation for alpha numeric and numbersb

Any Idea about this both alpha numeric and values between 100-200 should work.
ex.zx12should work
ex.101should work
ex.201 should not work.
Any formula idea about this.
Best Answer chosen by lincy
ShirishaShirisha (Salesforce Developers) 
Hi Lincy,

Greetings!

Can you please check the below post for the sample validation for alphanumeric:

https://success.salesforce.com/answers?id=906300000004BctAAE

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Warm Regards,
Shirisha Pathuri