Java String match from end ignoring case

//package com.demo2s;

public class Main {
  public static void main(String[] argv) throws Exception {
    String str = "demo2s.com";
    String suffix = "COM";
    System.out.println(endsWithIgnoreCase(str, suffix));
  }// w  ww . ja  v  a 2  s .c  o  m

  /**
   * <p>
   * Case insensitive check if a String ends with a specified suffix.
   * </p>
   *
   * <p>
   * <code>null</code>s are handled without exceptions. Two <code>null</code>
   * references are considered to be equal. The comparison is case insensitive.
   * </p>
   *
   * <pre>
   * endsWithIgnoreCase(null, null)      = true
   * endsWithIgnoreCase(null, "abcdef")  = false
   * endsWithIgnoreCase("def", null)     = false
   * endsWithIgnoreCase("def", "abcdef") = true
   * endsWithIgnoreCase("def", "ABCDEF") = false
   * </pre>
   *
   * @see java.lang.String#endsWith(String)
   * @param str
   *          the String to check, may be null
   * @param suffix
   *          the suffix to find, may be null
   * @return <code>true</code> if the String ends with the suffix, case
   *         insensitive, or both <code>null</code>
   * @since 2.4
   */
  public static boolean endsWithIgnoreCase(String str, String suffix) {
    return endsWith(str, suffix, true);
  }

  /**
   * <p>
   * Check if a String ends with a specified suffix.
   * </p>
   *
   * <p>
   * <code>null</code>s are handled without exceptions. Two <code>null</code>
   * references are considered to be equal. The comparison is case sensitive.
   * </p>
   *
   * <pre>
   * endsWith(null, null)      = true
   * endsWith(null, "abcdef")  = false
   * endsWith("def", null)     = false
   * endsWith("def", "abcdef") = true
   * endsWith("def", "ABCDEF") = false
   * </pre>
   *
   * @see java.lang.String#endsWith(String)
   * @param str
   *          the String to check, may be null
   * @param suffix
   *          the suffix to find, may be null
   * @return <code>true</code> if the String ends with the suffix, case sensitive,
   *         or both <code>null</code>
   * @since 2.4
   */
  public static boolean endsWith(String str, String suffix) {
    return endsWith(str, suffix, false);
  }

  /**
   * <p>
   * Check if a String ends with a specified suffix (optionally case insensitive).
   * </p>
   *
   * @see java.lang.String#endsWith(String)
   * @param str
   *          the String to check, may be null
   * @param suffix
   *          the suffix to find, may be null
   * @param ignoreCase
   *          inidicates whether the compare should ignore case (case insensitive)
   *          or not.
   * @return <code>true</code> if the String starts with the prefix or both
   *         <code>null</code>
   */
  private static boolean endsWith(String str, String suffix, boolean ignoreCase) {
    if (str == null || suffix == null) {
      return (str == null && suffix == null);
    }
    if (suffix.length() > str.length()) {
      return false;
    }
    int strOffset = str.length() - suffix.length();
    return str.regionMatches(ignoreCase, strOffset, suffix, 0, suffix.length());
  }

}
/*
 * Licensed 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.
 */