Question: A function on Unix based systems that search for four or more printable characters with an unprintable character at the end is called: A function

A function on Unix based systems that search for four or more printable characters with an unprintable character at the end is called:
A function on Unix based systems that search for four or more printable characters with an unprintable character at the end is called:
Strings
GREP
Regex
None of the above

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