Stripping ASCII codes when parsing

[David Pratt]

I am working with a text format that advises to strip any ascii control 
characters (0 - 30) as part of parsing data and also the ascii pipe 
character (124) from the data. I think many of these characters are 
from a different time. Since I have never seen most of these characters 
in text I am not sure how these first 30 control characters are all 
represented (other than say tab (\t), newline(\n), line return(\r) ) so 
what should I do to remove these characters if they are ever 
encountered. Many thanks.