Regular Expressions,.NET, C# Programming

Positive decimal value regular expression with max 3 decimal places:
Regular Expressions, .NET, C# Programming Language
* Accepts all positive decimal values (currently only accepts values greater and equal to one (1))
* i.e accepts ---> 0.0001
* Can have maximum 3 decimal places.
* Decimal places are optional.
This regular expression will be used to validate currency input.
1:ValidationExpression="^\d*[1-9]\d*(\.\d+)?$"

Validate Indian Vehicle Number:
@"^[a-zA-Z]{2}[a-zA-Z0-9]{0,6}[0-9]{3}$"

http://www.cs.princeton.edu/introcs/72regular/