T-SQL中的正则表达式

Question

I have the next issue, there is table with column data (type - nvarchar), this column can contains any characters, I need selected only data which are numbers or range of numbers, but to ignore white spaces. For example:

declare @tmp table (data nvarchar(192), Result nvarchar(192));

insert into @tmp SELECT '123', '<- valid';
insert into @tmp SELECT ' 123 ', '<- valid';
insert into @tmp SELECT '123-123', '<- valid';
insert into @tmp SELECT ' 123 - 123 ', '<- valid';
insert into @tmp SELECT '123jmj', '<- invalid';
insert into @tmp SELECT '123,5441', '<- invalid';
insert into @tmp SELECT '123,yjyj', '<- invalid';

SELECT * FROM @tmp

The result dataset must contains only valid rows. I can try the next

SELECT * FROM @tmp WHERE data NOT LIKE '%[^0-9]%'

But I got only first row.

Answer 1

First replace the white spaces with empty string

Next replace the - with .

Third use ParseName trick to separate the data.

After the separation you can filter the records using NOT LIKE '%[^0-9]%'

SELECT data
FROM   (SELECT *,
               Parsename(Replace(Replace(data, ' ', ''), '-', '.'), 2) st,
               Parsename(Replace(Replace(data, ' ', ''), '-', '.'), 1) ed
        FROM   @tmp) a
WHERE  st NOT LIKE '%[^0-9]%'
        OR ed NOT LIKE '%[^0-9]%'