Class egrep

source code

       object --+    
                |    
             pype --+
                    |
       object --+   |
                |   |
          stacker --+
                    |
   object --+       |
            |       |
   linebuffer --+   |
                |   |
inputfilterbuffer --+
                    |
                   egrep

copy all lines offered to it in a pipeline and that match one of its regular expression arguments and makes it available to the next component in the pipeline.

example: cat('*.txt') | grep(r'^ab*c$') > sys.stdout