CharSequenceUtils.java

package org.apache.commons.lang3;

public class CharSequenceUtils
{
  static boolean regionMatches(CharSequence cs, boolean ignoreCase, int thisStart, CharSequence substring, int start, int length)
  {
    if (((cs instanceof String)) && ((substring instanceof String))) {
      return ((String)cs).regionMatches(ignoreCase, thisStart, (String)substring, start, length);
    }

    return cs.toString().regionMatches(ignoreCase, thisStart, substring.toString(), start, length);
  }
}