How to find with lookahead in Visual studio 2012 Regex Find and Replace

Question

I am trying to find all using statements that are in cs files that contain a reference to a class anywhere in the file following it.

For example, I want to match using Example.Foo; if BaseClass<SomeClass> is found anywhere in the file following it.

Like such:

I've tried (using Example.Foo;)(?=[.\\s\\n]*BaseClass\\<SomeClass\\>[.\\s\\n]*) but no joy...

UPDATE

For clarity, this is for the VS 2012 IDE Find and Replace dialog.

Answer 1

You need to add a (?s), which enables multiline matching, and also escape the period in using Example.Foo . The regex should be something along the lines of:

(?s)using Example\\.Foo;(?=.*BaseClass<SomeClass>)

Answer 2

I figured it out myself.

(?s)using Example\.Foo;(?=(.*|\s\r)BaseClass\<SomeClass\>(.*|\s\r))

This does the trick!

Thanks for the (?s) hint, that was required! +1 for that...