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From: "Daniel Pitts" <daniel.pitts@1:261/38.remove-5qr-this>
Subject: Re: retriving escape unicode sequences from files ...
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Date: Sat, 04 Aug 2012 18:41:42 GMT
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  To: Arne Vajhøj
From: Daniel Pitts <newsgroup.nospam@virtualinfinity.net>

On 8/3/12 5:37 PM, Arne Vajhoj wrote:
> On 8/2/2012 11:52 PM, qwertmonkey@syberianoutpost.ru wrote:
>>   Why is it that if you save a unicode sequence in a file, say "frantais"
>> ~
>> \u0066\u0072\u0061\u006e\u00e7\u0061\u0069\u0073
>> ~
>>   and then retrieve as a String you can't then convert it back to a
>> UTF-8 String
>> ~
>
> Some code from my shelf:
>
> import java.util.regex.Matcher;
> import java.util.regex.Pattern;
>
> public class Unescape {
>      private static final Pattern p =
> Pattern.compile("\\\\u([0-9A-F]{4})");
>      public static String U2U(String s) {
>          String res = s;
>          Matcher m = p.matcher(res);
>          while(m.find()) {
>              res = res.replaceAll("\\" + m.group(0),
> Character.toString((char)Integer.parseInt(m.group(1), 16)));
>          }
>          return res;
>      }
>      public static void main(String[] args) {
>
> System.out.println(U2U("\\u0041\\u0042\\u0043\\u000A\\u0031\\u0032\\u0033"));
>
>      }
> }
And if you wanted this to be effecient, you'd use appendReplacement instead of 
res.replaceAll()

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