java substring()函数删除指定字符串

java substring()函数删除指定字符串
public class main {

  /**
   * case insensitive removal of a substring if it is at the end of a source string,
   * otherwise returns the source string.
   *
   * a <code>null</code> source string will return <code>null</code>.
   * an empty ("") source string will return the empty string.
   * a <code>null</code> search string will return the source string.
   *
   * <pre>
   * stringutils.removeend(null, *)      = null
   * stringutils.removeend("", *)        = ""
   * stringutils.removeend(*, null)      = *
   * stringutils.removeend("www.domain.com", ".com.")  = "www.domain.com."
   * stringutils.removeend("www.domain.com", ".com")   = "www.domain"
   * stringutils.removeend("www.domain.com", "domain") = "www.domain.com"
   * stringutils.removeend("abc", "")    = "abc"
   * </pre>
   *
   * @param str  the source string to search, may be null
   * @param remove  the string to search for (case insensitive) and remove, may be null
   * @return the substring with the string removed if found,
   *  <code>null</code> if null string input
   * @since 2.4
   */
  public static string removeendignorecase(string str, string remove) {
      if (isempty(str) || isempty(remove)) {
          return str;
      }
      if (endswithignorecase(str, remove)) {
          return str.substring(0, str.length() - remove.length());
      }
      return str;
  }
  /**
   * case insensitive check if a string ends with a specified suffix.
   *
   * <code>null</code>s are handled without exceptions. two <code>null</code>
   * references are considered to be equal. the comparison is case insensitive.
   *
   * <pre>
   * stringutils.endswithignorecase(null, null)      = true
   * stringutils.endswithignorecase(null, "abcdef")  = false
   * stringutils.endswithignorecase("def", null)     = false
   * stringutils.endswithignorecase("def", "abcdef") = true
   * stringutils.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);
  }

  /**
   * check if a string ends with a specified suffix (optionally case insensitive).
   *
   * @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());
  }
  // empty checks
  //-----------------------------------------------------------------------
  /**
   * checks if a string is empty ("") or null.
   *
   * <pre>
   * stringutils.isempty(null)      = true
   * stringutils.isempty("")        = true
   * stringutils.isempty(" ")       = false
   * stringutils.isempty("bob")     = false
   * stringutils.isempty("  bob  ") = false
   * </pre>
   *
   * note: this method changed in lang version 2.0.
   * it no longer trims the string.
   * that functionality is available in isblank().
   *
   * @param str  the string to check, may be null
   * @return <code>true</code> if the string is empty or null
   */
  public static boolean isempty(string str) {
      return str == null || str.length() == 0;
  }
}

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