Valid for Sitecore
5.2, 5.3
I tried the following validation expression ".{1,200}" but the message never appeared. Why it does not work?
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You can use the usual C# regular expression. This is the right example: ^\w{1,200}$ When you empty the HTML field, so you probably have the string "<p></p>" in the HTML editor - that is the way how HTML editor works. This string falls within the ^\w{1,200}$ match.