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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.pattern.util;

/**
 * This implementation is intended for use in PatternLayout.
 *
 * @author Ceki Gülcü
 */
public class RestrictedEscapeUtil implements IEscapeUtil {

    public void escape(String escapeChars, StringBuffer buf, char next, int pointer) {
        if (escapeChars.indexOf(next) >= 0) {
            buf.append(next);
        } else {
            // restitute the escape char (because it was consumed
            // before this method was called).
            buf.append("\\");
            // restitute the next character
            buf.append(next);
        }
    }

}