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Convert string by from "\\u0064" to "\u0064" or "d"?

Posted on 2007-03-17
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Last Modified: 2013-12-29
how can I convert a string like this:

String result = "unde\\146ine\\u0064";

into a string like this:

String result = "unde\146ine\u0064";
(this mean that new string result = "undefined";      \\146 --> \146 or d,    \\u0064 --> \u0064 or d)

thanks!
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Question by:hieukhtn
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9 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 18739763
result = result.replaceAll("\\\\\\\\", "\\\\");
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LVL 92

Assisted Solution

by:objects
objects earned 125 total points
ID: 18740004
try something like:

            StringBuilder result = new StringBuilder();
            for (int i=0; i<s.length(); i++)
            {
               if (s.substring(i).startsWith("\\u"))
               {
                   result.append((char) Integer.parseInt(s.substring(i+2, i+6), 16));
                   i += 5;
               }
               else if (s.substring(i).startsWith("\\"))
               {
                   result.append((char) Integer.parseInt(s.substring(i+1, i+4), 8));
                   i += 3;
               }
               else
               {
                  result.append(s.charAt(i));
               }
            }
0
 
LVL 23

Expert Comment

by:Siva Prasanna Kumar
ID: 18740278
I didn't get u.
Why do u want to convert like that.

String result = "unde\\146ine\\u0064";

just see what it prints by using System.out.println(result);

it prints  "unde\146ine\u0064";

Thats what u want if i am getting it wrong please clarify :)
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LVL 30

Expert Comment

by:Mayank S
ID: 18746291
Yeah by the looks of your question, aren't you already doing what you want to do?

>> this mean that new string result = "undefined";  

What does that mean?
0
 
LVL 13

Accepted Solution

by:
Webstorm earned 125 total points
ID: 18748310
try object's solution
or this one if you want to manage errors, and other escaped characters :

public static string unescape(String s)
{
      StringBuffer result = new StringBuffer();
      int j=0,i;
      while (  (i = s.indexOf('\\', j)) >=0 )
      {
           result.append( s.substring(j,i) );
           try
           {
               if (s.startsWith("\\u", i))
               {
                    result.append( (char) Integer.parseInt(s.substring(i+2, i+6), 16) );
                    j = i + 6;
               }
               else if (s.startsWith("\\x", i))
               {
                    result.append( (char) Integer.parseInt(s.substring(i+2, i+4), 16) );
                    j = i + 4;
               }
               else if (s.startsWith("\\n", i)) result.append('\n');
               else if (s.startsWith("\\r", i)) result.append('\r');
               else if (s.startsWith("\\t", i)) result.append('\t');
               else if (s.startsWith("\\b", i)) result.append('\b');
               else if (s.startsWith("\\f", i)) result.append('\f');
               else
               {
                    result.append((char) Integer.parseInt(s.substring(i+1, i+4), 8));
                    j = i + 4;
               }
           } catch(Exception ex)
           {
                  if (i+1 <s.length())
                  {
                       j=i+2;
                       result.append( s.charAt(i+1) );
                  }
                  else result.append( '\\' );
           }
     }
      result.append( s.substring(j) );
      return result.toString();
}
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 18768963
Welcome back Webstorm :)
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 18779729
Thanks mayankeagle :)
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