Match Nonprintable Characters
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1. Requirement
Match a string of the following ASCII control characters:
bell, escape, form feed, line feed, carriage return, horizontal tab, vertical tab
2. Code
-----------------------------------------------------------------------------------------------------
| Control characters | representation way | control way | 7-bit way |
-------------------------------------------------------------------------------------------------------
| bell | \a | \cG | \x07 |
--------------------------------------------------------------------------------------------------------
| escape | \e | -- | \x1B |
--------------------------------------------------------------------------------------------------------
| form feed | \f | \cL | \x0C |
--------------------------------------------------------------------------------------------------------
| line feed(newline) | \n | \cJ | \x0A |
--------------------------------------------------------------------------------------------------------
| carriage return | \r | \cM | \x0D |
---------------------------------------------------------------------------------------------------------
| horizontal tab | \t | \cI | \x09 |
---------------------------------------------------------------------------------------------------------
| vertical tab | \v | \cK | \x0B |
---------------------------------------------------------------------------------------------------------
3. Ascii
- Match Nonprintable Characters
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