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diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/regexp/Regexp.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/regexp/Regexp.java
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+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/regexp/Regexp.java
@@ -0,0 +1,50 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+package org.apache.tools.ant.util.regexp;
+
+import org.apache.tools.ant.BuildException;
+
+/***
+ * Interface which represents a regular expression, and the operations
+ * that can be performed on it.
+ *
+ */
+public interface Regexp extends RegexpMatcher {
+
+    /**
+     * Replace only the first occurrence of the regular expression
+     */
+    int REPLACE_FIRST          = 0x00000001;
+
+    /**
+     * Replace all occurrences of the regular expression
+     */
+    int REPLACE_ALL            = 0x00000010;
+
+    /**
+     * Perform a substitution on the regular expression.
+     * @param input The string to substitute on
+     * @param argument The string which defines the substitution
+     * @param options The list of options for the match and replace. See the
+     *                MATCH_ and REPLACE_ constants above.
+     * @return the result of the operation
+     * @throws BuildException on error
+     */
+    String substitute(String input, String argument, int options)
+        throws BuildException;
+}