Reguler Expression validation to allow blank/empty and decimal/integer values

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Hi Friends

I need a reguler expression that allows:

1) blank or empty
2) decimal values
3) integer values

C#

[Required(ErrorMessage = "rate 1 is required")]
[RegularExpression(@"[0-9]*\.?[0-9]*$", ErrorMessage = "rate 1 is in numeric formate")]
public decimal Rate1 { get; set; }

Please help me, the above expression is not allowing null values.

Thanks

Posted 29-Aug-12 3:52am

deepakaitr12345

Updated 29-Aug-12 4:11am

Yvan Rodrigues

v4

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fjdiewornncalwe · Answer 1 · 2012-08-29T04:07:00

Solution 1

You have the Required attribute on there. If a value is required it cannot be null. The regular expression has nothing to do with it.

Posted 29-Aug-12 4:07am

fjdiewornncalwe

Andreas Gieriet · Answer 2 · 2012-08-29T05:51:00

So, you allow (I assume with leading and trailing spaces)
1. lines of only spaces, zero to any number of them
2. plain integral numbers
3. numbers with decimal part and optional part before the decimal part

The regex for these individual parts is:
1. ^\s*$
2. ^\s*\d+\s*$
3. ^\s*\d*\.\d+\s*$

Putting it all together and combine common parts:
begin, optional-spaces, optional-number, optional-spaces, end
or in Regex:
^\s*(?:\d+|\d*\.\d+)?\s*$

Cheers
Andi