In validating textbox in,
I want to allow the user to enter value based on the conditions.

Not Allowed
1. Only special characters not allowed (Ex: !@#)
2. Only Numbers not allowed (Ex: 3456)

3. characters only small letters allowed. (Ex: asd)
4. characters only capital letters allowed. (Ex: ASD)
5. characters having both capital and small letters allowed. (Ex: AsdF)
6. Value including Alphabets,numbers and special characters allowed (Ex: A23$, a67%)

I want these case to be implemented through RegularExpressions

Can anyone help me with ideas?,........./