text: -- @testpoint: 模式匹配POSIX正则表达式,使用$自串尾匹配
  DROP TABLE IF EXISTS type_char;
  CREATE TABLE type_char (string1 varchar(10));
  insert into type_char values ('abc');
  SELECT * from type_char  where string1 ~ 'c$';
  SELECT * from type_char  where string1 ~ '$';
  SELECT * from type_char  where string1 ~ '(abc)$';
  DROP TABLE IF EXISTS type_char;