Ufdjrw

I know that, the following query returns the rows, which are contain the exact 5 characters between the A and G

select * 
from 
 (select 'prefixABBBBBGsuffix' code /*this will be returned. */
 union 
 select 'prefixABBBBGsuffix') rex 
where 
 code like '%A_____G%' 

But I want 17 character between A and G, then like condition must have 17 underscores. So I search little in google I found [] will be used in like. Then I tried so for.

select * 
from 
 (select 'AprefixABBBBBGsuffixG' code 
 union 
 select 'AprefixABBBBGsuffixG') rex 
where 
 code like '%A[_]^17G%' /*As per my understanding, '[]' makes a set. And 
 '^17' would be power of the set (like Mathematics).*/

Then it returns the NULL set. How can I search rows which has certain number of character in the set []?

Note:

I'm using SQL Server 2012.

same answer as previously but corrected. 17 wasn't the number, it was 18 and 19 for strings, also put in the len(textbetweenA and G) to show.

select rex.* 
from (
 select len('prefixABBBBBGsuffix') leng, 'AprefixABBBBBGsuffixG' code 
 union 
 select len('prefixABBBBGsuffix'), 'AprefixABBBBGsuffixG'
 union
 select 0, 'A___________________G'
 ) rex 
where 
 rex.code like '%A' + replicate('_',19) + 'G%'

--and with [] the set would be [A-Za-z]. Notice this set does not match the A___________________G string.

select rex.* 
from (
 select len('prefixABBBBBGsuffix') leng, 'AprefixABBBBBGsuffixG' code 
 union 
 select len('prefixABBBBGsuffix'), 'AprefixABBBBGsuffixG'
 union
 select 0, 'A___________________G'
 ) rex 
where 
 rex.code like '%A' + replicate('[A-Za-z]',19) + 'G%'

[A-Za-z0-9] matches one character within the scope of alphabet (both cases) or a number 0 through 9

I can't find any working information about another way to handle a number of chars like that, replicate is just a way to ease parameterization and typing.

I would use REPLICATE to generate desired number of '_':

select * from (
 select 'prefixABBBBBGsuffix' code 
 union 
 select 'prefixABBBBGsuffix' 
) rex 
where code like '%A' + REPLICATE('_',17) + 'G%';