SQL Server使用正则表达式选择

Question

can we use regular expression to select the item from database? The table item is like below

Table column|name|
10.01.02    | a  |
100.2.03    | b  |
1021.10.04  | c  |

Now my problem is that i need to select the column and get the substring like below

Table column|name|
10.01       | a  |
100.2       | b  |
1021.10     | c  |

any suggestion with regular expression or substring?

Answer 1

select left(a, datalength(a) - charindex('.', reverse(a))), b
from (
    select '10.01.02', 'a' union all
    select '100.2.03', 'b' union all
    select '1021.10.04', 'c'
) t(a,b)

I think there is no solution with regexp.

UPD

Another solution:

select reverse(parsename(reverse(a), 1)) + '.' + reverse(parsename(reverse(a), 2)), b
from (
    select '10.01.02', 'a' union all
    select '100.2.03', 'b' union all
    select '1021.10.04', 'c'
) t(a,b)

Answer 2

There may simple smarter way. But this is what i can think of.

select substr(column, 1,lenght(column)-instr(reverse(column),'.'), name from table;

Answer 3

Try this,

SELECT SUBSTRING(column1,0,(CHARINDEX('.',column1,CHARINDEX('.',column1)+1))) 
FROM Table1

SQL Fiddle Demo