One thing which works for C is to search something like `[a-z] foo\(.+\) \{` assuming that spacing matches the coding style, often the shorter form `[a-z] foo\(

One thing which works for C is to search something like `[a-z] foo\(.+\) \{` assuming that spacing matches the coding style, often the shorter form `[a-z] foo\(` works well, which tries to ensure there is a type definition and bin assignment or something before name. Then there is only a handful false positives.