A Ruby file parser/interpreter/preprocessor that comments lines of code based on conditions at the time the file is required. Very handy to implement debugging logs and code that has to be commented (not just dynamically switched off).
This is a simplified version of the GNU Grep. Search a RegExp on a file that contain all alphanumeric characters. Use special symbols like @ and # to extend the search. Now you can set Case Sensitive option and ignore withespaces during the search.