Regex based string length validation in Sitecore Rich Text Editor not working

Question

I applied one regex in the validation field to check if the entered characters in the RTE are less than 520 characters only, otherwise, it shows the error.

I've setup the validation as follows:

But this regex is not matching exactly, even when I enter the 518 characters it throws the error (setup in the validation text field).

I thought that may be the regex is not correct but when I used the online regex tester tool then it is behaving correctly.

So, before raising it to the Sitecore team I thought to confirm here.

I also tried to use the existing validation rules in the /sitecore/system/Settings/Validation Rules/Field Rules/Sample/Max Length 40 and I tried this also but it was not working and I was unable to change the message that the client wants to see when string length doesn't match the criteria.

So, I am just confirming if someone has any solution to why regex not working or raise it with the Sitecore support team.

FYI: My environment is Sitecore 10.2 MCC with SXA

Answer 1

I have had a go at implementing a validation rule that checks the field is less than 10 characters. Please try this out:

Duplicate an existing validation rule, that already uses sitecore RegexValidator.

These can be found here: /sitecore/system/Settings/Validation Rules/Field Rules/Common/

Name the item "Less than 10 Chracters" and give Title/Description.

Update Paramaters field to: Pattern=^.{0,10}$&Text=Field "{0}" must be less than 10 Characters.

Add the validation rule

Go to you field that you would like to validate and add the new validation action:

Test that it works

Go to your item and add more than 10 characters into your field.

Press the validate button.