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I have to insert some text data from the form 

  [70,165,531,0 | 70,166,562 | "Hi", 167,578. 70,171,593 71,179,593 | 73,188,609. "One", 1,3.   
 The data contains a few thousand letters (around 10000 - 50000).  
 I have read on various compression algorithms, but can not decide which key will be used here.  
 The important thing here is: the compressed string  should contain only alphanumeric characters  (or some special characters like + - / & amp;% @ $ ..) I mean That most algorithms provide ambiguous ascii characters correct as compressed data? It should be avoided  
 Can anyone guide me how to move forward here?  
 In the PS,  number ,  ' and  |  Characters mainly character other characters are very rare.   
 
 
 Actually your requirement is to automatically set the output character for printable characters You will end up using 25% of your compression profit, as you use about 6 out of 8 bits.  
 But if you really want, you can always produce base 64 or more space efficiently to convert raw biostream to printable characters.  
 For compression algorithm, for both well-known open source code, paste one of the better known ones like gzip or bzip2. > Choosing the "best" algorithm is not really easy, here's a part of the list of questions that you have to ask yourself:  
     
  1.  Do I have to encode or encoding But the best speed is required (e.g., the nap is quite asymmetric)  
  2.  How important is memory efficiency for the encoder and decoder?  
  3.  Size of important code for embedded code  
  4.  Do I want a well-tested code for an encoder or decoder or In the same or both languages ​​in the other language  
  5.  and so on   
     The bottom line here may be a representative sample of your data, and some tests with the existing algorithm Run, and on those criteria Benchmarks that are important in terms of your use.

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