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SQL> with tt as
  2  (
  3  select 'haha' string from dual union
  4  select '123' from dual union
  5  select 'haha12' from dual union
  6  select 'haha[]' from dual union
  7  select '12@@' from dual union
  8  select 'ah@!123' from dual
  9  )
 10  select string
 11  from
 12  (
 13  select string,translate(
 14  string,'abcdefghijklmnopqrstuvwxyz0987654321',
 15  rpad('#',26,'#')||rpad('*',10,'*')
 16  )
 17  translated from tt
 18  )
 19  where instr(translated,'#') > 0
 20  and instr(translated,'*') > 0;
STRING
-------
ah@!123
haha12
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        A         A      ZERO     ......

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SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;
       A       A    ZERO     SPACE
--------- --------- -- ......
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