grep functionality

["Daniel L. Boxwell" <Bo...@C-IV.org>]

I am looking for functionality in ANT that will allow me to define a list of forbidden strings and then grep for them throughout my source tree. In particular, I would like to be able to search for strings such as
	
	- System.out.println()
	- connection.commit()
	- etc. . .

Checkstyle will allow me to look for forbidden instantiations such as java.lang.Boolean, but that doesn't really solve my problem. . . I had originally thought of using the ReplaceRegExp task, but this task and all other regular expression based tasks I have found seem to be replacement oriented. Ideally I would have the ability to fail a build if a forbidden string crept into the code.

Any suggestions would be appreciated. I hope that I am just overlooking something simple!
 
Thanks,

--Dan