Name: nt126004 Date: 08/29/2001


Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta2-b77)
Java HotSpot(TM) Client VM (build 1.4.0-beta2-b77, mixed mode)

Two or more group references in a replacement string, with no characters between
them causes appendReplacement to ignore the $ of the second group ref.

The following code illustrates the problem. It should print

  Swap all: 123 = first, 456 = second
  Swap one: 123 = first, second = 456

Instead it prints

  Swap all: 1232first, 4562second
  Swap one: 1232first, second = 456

The code:

import java.util.regex.*;

public class RegTest {
public static void main(String [] argv) {
Pattern p = Pattern.compile("([a-z]+)( *= *)([0-9]+)");
String s1 = "Swap all: first = 123, second = 456";
String s2 = "Swap one: first = 123, second = 456";
String r = "$3$2$1";

Matcher m;

m = p.matcher(s1);

System.out.println(m.replaceAll(r));

m = p.matcher(s2);

if (m.find()) {
StringBuffer sb = new StringBuffer();
m.appendReplacement(sb, r);
m.appendTail(sb);
System.out.println(sb);
}
}
}
(Review ID: 130880)
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