Could we put in the Tag Wiki Excerpt a little description on how to use the tag? For example, regex tags 90% of the time require a tag about the language you are using the Regex with. So we could write: "Regular expressions are a powerful form of declarative programming language, mainly used for pattern matching within strings. When you use this tag, remember to add the tag of the language you are using the regular expression with" or for "versioned" tags add a note that it's better to add the "main tag". So for example in the c#-4.0 we could write "C# 4.0 introduces features like dynamic objects, and optional and named parameters. There are also improvements in the area of COM interoperability. It's often better to add the C# tag or the .NET tag to your questions when you use this tag".
The reasoning: Regex questions DO need the language used, and newbies don't know it (and it's their right: nowhere it's written). Versioned tags suffer from the fact that many persons follow only the "main" tag and filter their question for that tag (so if you tag your question c#-4.0 the possibilities you have a person will notice it are lower than if you had tagged it c#c#-4.0. This happens especially if you misstag using tags like asp.net or silverlight. Often your problem isn't really of asp.net or of silverlight. It's of pure C#.)