Match Nonprintable Characters

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

（编辑：李大同）

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