firebird - 仅从文本中选择数字

Question

任何人都可以帮助我如何只从文本中选择数字？

字符串可以是随机的，例如:

ABCD123DEF -> Result must be 123
393SEA981F -> Result must be 393981

谢谢!Firebird 版本是 2.5

Answer 1

首先想到的是:

使用存储过程作为:

SET TERM ^ ;

create or alter procedure GET_DIGIT_ONLY (
    IPARAM varchar(32))
returns (
    OPARAM varchar(32))
as
declare variable I integer;
begin
  oparam = '';
  i = 1;
  while (i <= char_length(:iparam)) do
  begin
    if (substring(:iparam from i for 1) similar to '[0123456789]')  then
      oparam = :oparam || (substring(:iparam from i for 1));
    i = :i + 1;
  end
  suspend;
end^

SET TERM ; ^

使用方法:

execute procedure get_digit_only :input_param
returning_values :output_param

或

select get_digit_only.oparam from get_digit_only ('393SEA981F')