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

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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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