Windows search tool wasn't enough to find the methods I was looking for, inside .jad files. So I wrote a few lines of C# code to have this explendid tool. It behaves like Linux grep, except for its regular expressions, lol.
1: start folder path (e.g.: c:\)
2: file pattern (e.g.: *.class)
3: search string (e.g.: getFromLocation)
Full example : WinGrep.exe c:\ *.class getFromLocation