I was trying out adding a regex to determine invalid email addresses and naturally it didnt work. So I went to remove it and of course the problem I am left now is that I am unable to remove the regex in the GUI despite clicking the Remove button. I am saving it after as well but I find that I'll go to another section and come back and the regex is still there Is there a command line instruction I can run to remove it?
Thanks in advance. You all rock.

FYI: the section in question is in Configuration > Global Config > Advanced