Regex to match 2 digits, optional decimal, two digits

Question

I\'ve spent half an hour trying to get this, maybe someone can come up with it quickly.

I need a regular expression that will match one or two digits, followed by an

Answer 1

Following is Very Good Regular expression for Two digits and two decimal points.

[RegularExpression(@"\d{0,2}(\.\d{1,2})?", ErrorMessage = "{0} must be a Decimal Number.")]

Answer 2

EDIT: Changed to fit other feedback.

I understood you to mean that if there is no decimal point, then there shouldn't be two more digits. So this should be it:

\d{0,2}(\.\d{1,2})?

That should do the trick in most implementations. If not, you can use:

[0-9]?[0-9]?(\.[0-9][0-9]?)?

And that should work on every implementation I've seen.

Answer 3

you can use

let regex = new RegExp( ^(?=[0-9.]{1,${maxlength}}$)[0-9]+(?:\.[0-9]{0,${decimal_number}})?$ );

where you can decide the maximum length and up to which decimal point you want to control the value

Use ES6 String interpolation to wrap the variables ${maxlength} and ${decimal_number}.

Answer 4

A previous answer is mostly correct, but it will also match the empty string. The following would solve this.

^([0-9]?[0-9](\.[0-9][0-9]?)?)|([0-9]?[0-9]?(\.[0-9][0-9]?))$

Answer 5

Try this

\d{1,2}\.?(\.\d{1,2})?