Need help phrasing regular expression to find particular T-SQL pattern
The "magic" regexp to do what you want is:

^[\s\t]*INSERT( INTO|)[\s\t\r\n]*[A-Za-z0-9_."\[\]]*[\s\t\r\n]*(SELECT|VALUES)\s


I tested some scenarios in "The Regex Coach" (a free software to test regexp). I made sure it also works for tables like [dbo].[tablename] or "tablename" etc.