code: public static boolean containsAny(String str, char[] searchChars) {
        if (str == null || str.length() == 0 || searchChars == null || searchChars.length == 0) {
            return false;
        }
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            for (int j = 0; j < searchChars.length; j++) {
                if (searchChars[j] == ch) {
                    return true;
                }
            }
        }
        return false;
    }
docs: <p>Checks if the String contains any character in the given
  set of characters.</p>
  
  <p>A <code>null</code> String will return <code>false</code>.
  A <code>null</code> or zero length search array will return <code>false</code>.</p>
  
  <pre>
  GosuStringUtil.containsAny(null, *)                = false
  GosuStringUtil.containsAny("", *)                  = false
  GosuStringUtil.containsAny(*, null)                = false
  GosuStringUtil.containsAny(*, [])                  = false
  GosuStringUtil.containsAny("zzabyycdxx",['z','a']) = true
  GosuStringUtil.containsAny("zzabyycdxx",['b','y']) = true
  GosuStringUtil.containsAny("aba", ['z'])           = false
  </pre>
  
  @param str  the String to check, may be null
  @param searchChars  the chars to search for, may be null
  @return the <code>true</code> if any of the chars are found,
  <code>false</code> if no match or null input
  @since 2.4