Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #7915

Re: unicode

Show all headers | View raw

On 9/12/2011 12:24 PM, bob wrote:
> Why does Java complain when I do this?
>
> 	html = html.replaceAll("\u000A", " ");
>
> This one works:
>
> 		// nbsp
> 		html = html.replaceAll("\u00A0", " ");


That was interesting.  From the docs on java.util.regex.Pattern;

"Comparison to Perl 5

The Pattern engine performs traditional NFA-based matching with ordered 
alternation as occurs in Perl 5.

Perl constructs not supported by this class:
     .
     .
     .
     The preprocessing operations \l \u, \L, and \U."

You can however do this, which is even more interesting!

public class test {
     public static void main(String[] args) {
         String html = "hello world!\n";
         html = html.replaceAll("\\x{a}","~");
         System.out.println(html);
     }
}

C:\Documents and Settings\Knute Johnson>java test
hello world!~

 From the Java Language Specification

"Because Unicode escapes are processed very early, it is not correct to 
write "\u000a" for a string literal containing a single linefeed (LF); 
the Unicode escape \u000a is transformed into an actual linefeed in 
translation step 1 (§3.3) and the linefeed becomes a LineTerminator in 
step 2 (§3.4), and so the string literal is not valid in step 3. 
Instead, one should write "\n" (§3.10.6). Similarly, it is not correct 
to write "\u000d" for a string literal containing a single carriage 
return (CR). Instead use "\r"."

And there you have it!

-- 

Knute Johnson

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

unicode bob <bob@coolgroups.com> - 2011-09-12 12:24 -0700
  Re: unicode Knute Johnson <nospam@knutejohnson.com> - 2011-09-12 14:04 -0700
  Re: unicode Roedy Green <see_website@mindprod.com.invalid> - 2011-09-12 14:08 -0700
    Re: unicode Arne Vajhøj <arne@vajhoej.dk> - 2011-09-12 17:31 -0400
      Re: unicode markspace <-@.> - 2011-09-12 16:33 -0700
        Re: unicode Lew <lewbloch@gmail.com> - 2011-09-12 17:46 -0700
          Re: unicode markspace <-@.> - 2011-09-12 20:16 -0700
          Re: unicode Roedy Green <see_website@mindprod.com.invalid> - 2011-09-12 22:05 -0700
            Re: unicode Roedy Green <see_website@mindprod.com.invalid> - 2011-09-12 22:10 -0700
            Re: unicode Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-13 07:18 +0000
        Re: unicode Arne Vajhøj <arne@vajhoej.dk> - 2011-09-12 20:57 -0400
          Re: unicode markspace <-@.> - 2011-09-12 19:51 -0700
            Re: unicode Arne Vajhøj <arne@vajhoej.dk> - 2011-09-13 20:17 -0400
              Re: unicode markspace <-@.> - 2011-09-13 19:32 -0700
                Re: unicode Roedy Green <see_website@mindprod.com.invalid> - 2011-09-14 11:49 -0700
          Re: unicode Paul Cager <paul.cager@googlemail.com> - 2011-09-13 04:05 -0700
        Re: unicode Roedy Green <see_website@mindprod.com.invalid> - 2011-09-12 22:02 -0700
          Re: unicode Arne Vajhøj <arne@vajhoej.dk> - 2011-09-13 20:30 -0400
  Re: unicode Arne Vajhøj <arne@vajhoej.dk> - 2011-09-12 17:29 -0400
    Re: unicode Lew <lewbloch@gmail.com> - 2011-09-12 15:48 -0700

csiph-web