Decimal format in Regular Expression

In winforms, I use Regular expression to check decimal format. Pl开发者_如何学Pythonease check whether my format is correct or not.

For example

123456.1234 

"^{0,1}[0-9]{0,1}[0-9]{0,1}[0-9]{0,1}[0-9]{0,1}[0-9]{0,1}[.]{0,1}[0-9]{0,1}[0-9]{0,1}[0-9]{0,1}$"

Is there any better format?

Actually I just wanna get 6 numeric and 4 decimal points only. How to format it?

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Wouldn't ^\d+(\.\d)?$ be better?

This check for a number at the start of the string, then maybe a . followed by another number.