How to break a Regex to multiple regex in Asp.Net MVC?

Question

I have a field, I have added a regex for it. So this regex does not allow more than 7 digits before decimal and more than two digits after the decimal. this is working fine, it gives an error message properly. Now I want to give different-2 messages for before decimal points and after decimal points. If the user enters more than 7 digits of a numeric value, then the error message will come under the field as “Maximum 7 digits are allowed.” If the user enters more than 2 digits of the decimal value, then the error message will come under field as “Maximum 2 digits of decimals are allowed.”

[RegularExpression("^\\d{0,7}(\\.\\d{0,2})?$", ErrorMessage = "Please enter Comment in the right format.")]
public decimal? decimalField { get; set; }

Edit: Can we do something line like? https://stackoverflow.com/a/4803634/13211840

If not possible in MVC then how is it possible using javascript or jquery?

It's not possible in single attribute, you would need to write your own JavaScript code for this. — Michał Turczyn
– Michał Turczyn, Commented Apr 12, 2020 at 13:19

dk1611 · Accepted Answer · 2020-04-12 14:37:05Z

0

I don't think so it's possible through data annotations. One approach could be, you explicitly validate your model and customize error message based on regex condition in your Action.

if (Regex.IsMatch("value", "regPattern"))
{
   ModelState.AddModelError("FieldName", "ErrorMessage");
}

answered Apr 12, 2020 at 14:37

dk1611

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The fourth bird · Accepted Answer · 2020-04-12 16:02:47Z

0

In your current pattern ^\\d{0,7}(\.\\d{0,2})?$ all parts are optional and will also match an empty string or a single dot as the decimal part accepts between 0 and 2 digits.

If you want to use 2 patterns for 2 different messages, you could match a pattern that allows 1-7 digits before the decimal and 1-2 digits after the dot.

If you want to allow a leading dot without a digit, you could use \\d{0,7} instead.

^\\d{1,7}(?:\\.\\d{1,2})?$

Regex demo

To match 1 to 7 digits:

^\\d{1,7}$

answered Apr 12, 2020 at 16:02

The fourth bird

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1 Comment

The fourth bird Over a year ago

Perhaps this page can be helpful stackoverflow.com/questions/30392997/…

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