I am seeing this error:
Value is invalid, it does not match the correct pattern
When I set a regex pattern in the doctype "Generic Properties" on something that is optional.
For example I setup a new UmbracoCMS 7.2.1 using Nuget with Visual Studio 2013 and after all the auto configuration/setup I went to the settings and added a regex to a new "optional" property called "title". Now when I go into "Content" and try to publish a page with the "TextPage" doctype (leaving the "Title" field blank) it returns the above error after postback for the "Title" field, even though the "Mandatory" checkbox is unchecked. Is there a work around for this ?
I first encountered this error in an existing Umbraco site that I just upgraded from v4 to v7.2 and I thought something had corrupted the templates but it doesn't seem to be the case.
Any help will be appreciated.