Bug ID: JDK-7067045 replaceAll("\u20ac", "$"); causses java.lang.StringIndexOutOfBoundsExceptio

Type: Enhancement
Component: core-libs
Sub-Component: java.util.regex
Affected Version: 6,6u10

Priority: P4
Status: Closed
Resolution: Fixed
OS: windows_xp
CPU: x86

Submitted: 2011-07-14
Updated: 2014-11-20
Resolved: 2012-05-14

JDK 8
8 b36Fixed

FULL PRODUCT VERSION :
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
  public void test(){
    String s1 = "\u20ac";
// or
// String s1 = "���";
    s1 = s1.replaceAll("\u20ac", "$");
//  or
//  s1 = s1.replaceAll("���", "$");
    System.out.println(s1);
  }

causes
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run:

  public void test(){
    String s1 = "\u20ac";
// or
// String s1 = "���";
    s1 = s1.replaceAll("\u20ac", "$");
//  or
//  s1 = s1.replaceAll("���", "$");
    System.out.println(s1);
  }

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
output of $ not an exception
ACTUAL -
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1
	at java.lang.String.charAt(Unknown Source)
	at java.util.regex.Matcher.appendReplacement(Unknown Source)
	at java.util.regex.Matcher.replaceAll(Unknown Source)
	at java.lang.String.replaceAll(Unknown Source)
...

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

  public void test(){
    String s1 = "\u20ac";
// or
// String s1 = "���";
    s1 = s1.replaceAll("\u20ac", "$");
//  or
//  s1 = s1.replaceAll("���", "$");
    System.out.println(s1);
  }
---------- END SOURCE ----------

EVALUATION "$" and backslash has special meaning in replacement string. use s1 = s1.replaceAll("\u20ac", "\\$"); instead. It appears, as the existing source comment suggested, IllegalArgumentException probably is a more appropriate exception to throw in this case. Change to RFE

12-04-2012

Duplicate :	JDK-8065421 - String replaceAll can throw StringIndexOutOfBoundsException
Duplicate :	JDK-6950971 - String.replaceAll is buggy