LimeSurvey version: 3.24.2
University server
==================
I tried a simple regex validation rule to prevent newline in a large text field:

/^.*$/

It works in the sense that the error message "Please check the format of your answer." appears when I press enter in the field, but this message does not disappear when I remove the newline.  I tried something similar with another character (not newline) and the same thing happens: the error message does not disappear after the unwanted character is deleted.

Hi,
this is not a bug but the default behaviour.
If you use this for validation
 
you will get the default message text

If there is an error in the "error color"
 

If there is no error in the default text color.
 

And this is fine, because this text does not indicate an error but requires your attention to the format.
Error or not is shown by the color and of course you cannot proceed in case of an error.

If you want to have a more specific error text - and no text if there is no error - you should use the question validation equation and the question validation tip
Like
 

Then you may get this
 



Joffm

 

I see. The color didn't change for me, possibly a template thing. It still seems like an error message to me with the icon and the way it appears. But thanks for the solution!

The message disappears, but the exclamation icon stays:
 

Actually, is there simply a way to prevent the entry of newlines, or to delete them in the saved answer?  

[url] forums.limesurvey.org/forum/installation...-a-hidden-tip#197282 [/url]