Despite plenty of similar cases having been discussed here, this exact issue is thornier than it may seem at first sight and I couldn't find a close enough match to this: Simply stated, the problem is, given a string, determine whether it is safe enough to print the string without doing anything nasty to just about any screen or printer oon the basis of this being assumed to be a text file (especially if we are talking about printing large files where a typical binary file being let through would cause mayhem). I refined the problem statement to this:
Using a regexp, filter the following character types: \x08 \x09 \x0B \x0C \x20 and any symbolic character (punctuation, numbers, letters, standard symbols...) and detect whether anything is left over. I can conceive of an ugly way to do this using ranges of characters - but is that really the best?
Many thanks in advance for any suggestions,
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