public static boolean hasExpressionOperators(final String str){
  boolean result=false;
  for (  final char chr : OPERATOR_FIRST_CHARS) {
    if (str.indexOf(chr) >= 0) {
      result=true;
      break;
    }
  }
  return result;
}

public static boolean hasExpressionOperators ( final String str ) { boolean result = false ; for ( final char chr : OPERATOR_FIRST_CHARS ) { if ( str . indexOf ( chr ) >= 0 ) { result = true ; break ; } } return result ; }
check that a string has a char of operators .
