How to test unprintable characters

Question: Hello:
We have a customized remote funtion zXX that, between other things, invokes to remote function BAPI_REQUISITION_CREATE; when zXX receives text data from strings generated by an .NET remote application, I need to replace non printable characters (line feed, cr, etc) by spaces only if the ABAP program detects this kind of characters.
How could I do this in ABAP?
Thanks!!!

Answer:
You want to replace? There might be a command for that.
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