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diff --git a/libjava/classpath/gnu/java/util/regex/REToken.java b/libjava/classpath/gnu/java/util/regex/REToken.java
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+/* gnu/regexp/REToken.java
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.util.regex;
+import java.io.Serializable;
+
+abstract class REToken implements Serializable, Cloneable {
+
+  protected REToken next = null;
+  protected REToken uncle = null;
+  protected int subIndex;
+  protected boolean unicodeAware = true;
+
+  public Object clone() {
+    try {
+      REToken copy = (REToken) super.clone();
+      return copy;
+    } catch (CloneNotSupportedException e) {
+      throw new Error(); // doesn't happen
+    }
+  }
+
+  protected REToken(int subIndex) {
+      this.subIndex = subIndex;
+  }
+
+  int getMinimumLength() {
+    return 0;
+  }
+
+  int getMaximumLength() {
+    return Integer.MAX_VALUE;
+  }
+
+  void setUncle(REToken anUncle) {
+    uncle = anUncle;
+  }
+
+    /** Returns true if the match succeeded, false if it failed. */
+    boolean match(CharIndexed input, REMatch mymatch) {
+	REMatch m = matchThis(input, mymatch);
+	if (m == null) return false;
+	if (next(input, m)) {
+	    mymatch.assignFrom(m);
+	    return true;
+	}
+	return false;
+    }
+
+    /** Returns true if the match succeeded, false if it failed.
+      * The matching is done against this REToken only. Chained
+      * tokens are not checked.
+      * This method is used to define the default match method.
+      * Simple subclasses of REToken, for example, such that
+      * matches only one character, should implement this method.
+      * Then the default match method will work.  But complicated
+      * subclasses of REToken, which needs a special match method,
+      * do not have to implement this method.
+      */
+    REMatch matchThis(CharIndexed input, REMatch mymatch) {
+	throw new UnsupportedOperationException(
+	    "This REToken does not have a matchThis method");
+    }
+  
+    /** Returns true if the rest of the tokens match, false if they fail. */
+    protected boolean next(CharIndexed input, REMatch mymatch) {
+	REToken nextToken = getNext();
+	if (nextToken == null) return true;
+	return nextToken.match(input, mymatch);
+    }
+
+    /** Returns the next REToken chained to this REToken. */
+    REToken getNext() {
+	return (next != null ? next : uncle);
+    }
+
+    /** Finds a match at the position specified by the given REMatch.
+      * If necessary, adds a BacktrackStack.Backtrack object to backtrackStack
+      * of the REmatch found this time so that another possible match
+      * may be found when backtrack is called.
+      * By default, nothing is added to the backtrackStack.
+      * @param CharIndexed input Input character sequence.
+      * @param mymatch Position at which a match should be found
+      * @return REMatch object if a match was found, null otherwise.
+      */
+    REMatch findMatch(CharIndexed input, REMatch mymatch) {
+        boolean b = match(input, mymatch);
+	if (b) return mymatch;
+	return null;
+    }
+
+    boolean returnsFixedLengthMatches() {
+	return false;
+    }
+
+    int findFixedLengthMatches(CharIndexed input, REMatch mymatch, int max) {
+	throw new UnsupportedOperationException(
+	    "This token does not support findFixedLengthMatches");
+    }
+
+    /**
+      * Backtrack to another possibility.
+      * Ordinary REToken cannot do anything if this method is called.
+      */
+    REMatch backtrack(CharIndexed input, REMatch mymatch, Object param) {
+	throw new IllegalStateException("This token cannot be backtracked to");
+    }
+
+  boolean chain(REToken token) {
+      next = token;
+      return true; // Token was accepted
+  }
+
+  abstract void dump(StringBuffer os);
+
+  void dumpAll(StringBuffer os) {
+    dump(os);
+    if (next != null) next.dumpAll(os);
+  }
+
+  public String toString() {
+    StringBuffer os = new StringBuffer();
+    dump(os);
+    return os.toString();
+  }
+
+  /**
+    * Converts the character argument to lowercase.
+    * @param ch the character to be converted.
+    * @param unicodeAware If true, use java.lang.Character#toLowerCase;
+    * otherwise, only US-ASCII charactes can be converted.
+    * @return the lowercase equivalent of the character, if any;
+    * otherwise, the character itself.
+    */
+  public static char toLowerCase(char ch, boolean unicodeAware) {
+    if (unicodeAware) return Character.toLowerCase(ch);
+    if (ch >= 'A' && ch <= 'Z') return (char)(ch + 'a' - 'A');
+    return ch;
+  }
+
+  /**
+    * Converts the character argument to uppercase.
+    * @param ch the character to be converted.
+    * @param unicodeAware If true, use java.lang.Character#toUpperCase;
+    * otherwise, only US-ASCII charactes can be converted.
+    * @return the uppercase equivalent of the character, if any;
+    * otherwise, the character itself.
+    */
+  public static char toUpperCase(char ch, boolean unicodeAware) {
+    if (unicodeAware) return Character.toUpperCase(ch);
+    if (ch >= 'a' && ch <= 'z') return (char)(ch + 'A' - 'a');
+    return ch;
+  }
+
+}