how to choose text from a file

Question

i have a text file like:

"GET /opacial/index.php?op=results&catalog=1&view=1&language=el&numhits=10&query=\xce\x95\xce\xbb\xce\xbb\xce\xac\xce\xb4\xce\xb1%20--%20\xce\x95\xce\xb8\xce\xbd\xce\xb9\xce\xba\xce\xad\xcf\x82%20\xcf\x83\xcf\x87\xce\xad\xcf\x83\xce\xb5\xce\xb9\xcf\x82%20
--%20\xce\x99\xcf\x83\xcf\x84\xce\xbf\xcf\x81\xce\xaf\xce\xb1&search_field=11&page=1

And i want to cut all the characters after the word "query" and before "&search". (bolds above). I am trying to cut the data, using patterns but something is wrong.. Can you give me an example for the example code above?

EDIT: An other problem , except the one above is that the matcher is used only for charSequences, and i have a file, which can not casted to charSequence... :\

"I am trying to cut the data" - show us what you've tried and we'll tell you where you're going wrong. — adarshr, Sep 19 '11 at 10:45
[What Have You Tried?](http://mattgemmell.com/2008/12/08/what-have-you-tried/) — Andrew Thompson, Sep 20 '11 at 05:51

score 3 · Answer 1 · edited May 23 '17 at 12:27

3

something like that:

   String yourNewText=yourOldText.split("query")[1].split("&search")[0];

?

to see how to read a file into a String, you can look here (there are different possiblities)

edited May 23 '17 at 12:27

Community

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answered Sep 19 '11 at 10:46

Neifen

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i am not sure, if this will do the job, cause my "yourOldText" is a file... How can this happen with a file? – user758084 Sep 19 '11 at 16:58
@user758084 read the file into a string via something like Apache Commons FileUtils.readFileToString. Notice that the regex solution I proposed would also require reading the file into a string. – John B Sep 19 '11 at 17:30

John B · Answer 2 · 2011-09-19T17:09:43.427

0

".*query\\=(.*)\\&search_field.*"

This regex should work to give you a capture of what you want to remove. Then String.replace should do the trick.

Edit - response to comment. The following code...

    String s = "GET /opacial/index.php?op=results&catalog=1&view=1&language=el&numhits=10&query=\\xce\\x95\\xce\\xbb\\xce\\xbb\\xce\\xac\\xce\\xb4\\xce\\xb1%20--%20\\xce\\x95\\xce\\xb8\\xce\\xbd\\xce\\xb9\\xce\\xba\\xce\\xad\\xcf\\x82%20\\xcf\\x83\\xcf\\x87\\xce\\xad\\xcf\\x83\\xce\\xb5\\xce\\xb9\\xcf\\x82%20 --%20\\xce\\x99\\xcf\\x83\\xcf\\x84\\xce\\xbf\\xcf\\x81\\xce\\xaf\\xce\\xb1&search_field=11&page=1";
    Pattern p = Pattern.compile(".*query\\=(.*)\\&search_field.*");
    Matcher m = p.matcher(s);
    if (m.matches()){
        String betweenQueryAndSearch = m.group(1);
        System.out.println(betweenQueryAndSearch);
    }

Produced the following output....

\xce\x95\xce\xbb\xce\xbb\xce\xac\xce\xb4\xce\xb1%20--%20\xce\x95\xce\xb8\xce\xbd\xce\xb9\xce\xba\xce\xad\xcf\x82%20\xcf\x83\xcf\x87\xce\xad\xcf\x83\xce\xb5\xce\xb9\xcf\x82%20 --%20\xce\x99\xcf\x83\xcf\x84\xce\xbf\xcf\x81\xce\xaf\xce\xb1

edited Sep 19 '11 at 17:09

answered Sep 19 '11 at 10:45

John B

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the regex looks good but i am not sure of how i will use it with my file.. i have a file just like my first post, and i must keep only those between "query " and "&search"... how this will happen with the regex? – user758084 Sep 19 '11 at 17:04
it works exactly as you said, but when i change String s = .... with String s = File.toString(); i take no output... That means that there is nothing to match.. But the file i exactly the same with the paradigm above plus some other data... :\ – user758084 Sep 19 '11 at 17:33
Per the Javadoc. File.toString() returns the path of the File. http://download.oracle.com/javase/6/docs/api/java/io/File.html#toString() – John B Sep 19 '11 at 17:45
To read a file you must READ it using an InputStream. Try Apache commons FileUtils#readFileToString http://commons.apache.org/io/apidocs/org/apache/commons/io/FileUtils.html#readFileToString(java.io.File) – John B Sep 19 '11 at 17:47

how to choose text from a file

2 Answers2