Hi,

What is the regular expresstion that I should use in order to accept only floating/double numbers. That's it; only digits are accepted with any amount and only one or none "." (dot) character is accepted, just like the below examples:

• 32.546
• .342
• 662
• 7.3 

Thanks in advance.

Use this regular expression:

^\d*\.?\d*$

Regular Expression Reference/Library
 

Thanks, that worked fine.

 But the only thing that it allows emty string. Could we make it don't accept empty string also without using the RequiredFieldValidator control?

You have to use the RequiredFieldValidator in addition to the RegularExpressionValidator - as it only fires the RegularExpressionValidator if there is something to validate (you might have a phone number field that is optional, but if they enter something, you want it to be a valid phone number).

the link is v. coolll!!!