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我一个乱码txt文件里有很多W3.UNIT5.12N011MS1VC，想写个程序把它提取出来，并且不重复，有没有什么比较好的函数，指点一下急

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就是这些文字W3.UNIT5.12N011MS1VC，把它提取出来，写到另一个文件。
比如象这个：< 5.000000) 乙  #(W3.UNIT5.12NU021GT AV < 95.000000) ?( $(W3.UNIT5.12NU021GT AV >= 95.000000)     ~d~        誆 "(W3.UNIT5.12NU021GT AV < 5.000000) 乙  #(W3.UNIT5.12NU021GT AV < 95.000000) ?( $(W3.UNIT5.12NU021GT AV >= 95.000000)              ??0?^=^  €€€      ?€€  €€€   ? ?#  0 €€€    €      ? ?#  0  噜    觋  I((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12)) ?( H((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12))  誆 H((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = ON12)) 葺 G((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = ON12))  誆  (W3.UNIT5.12N021MS1VC I4 = ON17) ?(  (W3.UNIT5.12N021MS1VC I4 = ON16)   €    乙  I((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12)) ?( H((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12))  誆 H((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = ON12)) 葺 G((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = ON12))  誆  (W3.UNIT5.12N021MS1VC I4 = ON17) ?(  (W3.UNIT5.12N021MS1VC I4 = ON16)     ?€€   噜    觋  I((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12)) ?( H((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12))  誆 H((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = ON12)) 葺 G((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = ON12))  誆  (W3.UNIT5.12N021MS1VC I4 = ON17) ?(  (W3.UNIT5.12N021MS1VC I4 = ON16)     ??+?Y=Y   噜    觋  I((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12)) ?( H((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = OFF12))  誆 H((W3.UNIT5.12N021MS1VC I4 = OFF11) AND (W3.UNIT5.12N021MS1VC I4 = ON12)) 葺 G((W3.UNIT5.12N021MS1VC I4 = ON11) AND (W3.UNIT5.12N021MS1VC I4 = ON12))  誆
不都是一样的东西吗?? 你直接把W3.UNIT5.12N021MS1VC写入其它文件不得了..