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
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| Control characters | representation way | control way | 7-bit way |
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| bell | \a | \cG | \x07 |
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| escape | \e | -- | \x1B |
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| form Feed | \f | \cL | \x0C |
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| line Feed(newline) | \n | \cJ | \x0A |
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| carriage return | \r | \cM | \x0D |
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| horizontal tab | \t | \cI | \x09 |
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| vertical tab | \v | \cK | \x0B |
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3. Ascii
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