Maximum string length
The maximum length allowed for a data string is 100 characters. For example, the following blockEnd tag contains a wildcard character.
<blockEnd><![CDATA[<!--\s*#BeginEditable\s*"\*"\s*-->]]></blockEnd>
Assuming the optional white space wildcard strings (\s*) are a single space character, which Adobe Dreamweaver generates automatically, then the data string is 26 characters long, plus a wildcard string (\*) for the name.
<!-- #BeginEditable "\*" -->
This leaves an editable region name that can be as man y as 74 characters, which is the maximum of 100 characters minus 26.