search for: id1_string1

...id1_string id2 id2_string z z_string w w_string stuff stuff stuff stuff stuff stuff stuff stuff stuff // x x_string1 y y_string1 z z_string1 w w_string1 stuff stuff stuff stuff stuff stuff stuff stuff stuff // x x_string2 y y_string2 id1 id1_string1 id2 id2_string1 z z_string2 w w_string2 stuff stuff stuff stuff stuff stuff stuff stuff stuff // ... ... I'd like to parse this file and retrieve the x, y, id1, id2, z, w fields and save them into a a matrix object: x y id1 id2 z w...