Find tags doesn’t contain specific attribute (specific word) using grep

How to find all server-side tags (<asp:) that doesn't contains attribute runat in my Visual Studio开发者_运维问答 2008 / MonoDevelop solution using grep?

The regex would be: <asp:((?!\brunat\s*=)[^>])*>. Note that if some attribute value contains "runat=", this won't match.

grep -lr "<asp:*" is the command you are looking for I think