表中有这么个字段
      Name
-----------------------------
      aa  
      aa[1]
      aa[2]
      aa(1)
      bb
      cc
      cc[1]
我想 要的效果
aa  4
bb  1
cc  2 

if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([Name] varchar(5))
insert [tb]
select 'aa' union all
select 'aa[1]' union all
select 'aa[2]' union all
select 'aa(1)' union all
select 'bb' union all
select 'cc' union all
select 'cc[1]'
go


select left(name,charindex('[',replace(name,'(','[')+'[')-1) as name,count(1) as cnt 
from tb
group by left(name,charindex('[',replace(name,'(','[')+'[')-1)

/**
name  cnt
----- -----------
aa    4
bb    1
cc    2

(3 行受影响)
**/

------解决方案--------------------
SQL code

go
create table #s(
col varchar(10)
)
insert #s
select 'B3' union all
select 'C1' union all
select 'D\4' union all
select '4MD' union all
select 'AR/12BD'
;with t
as(
select substring(col+' ',patindex( '%[0-9]% ',col+' '),len(col+' ')) as col1 
from #s
)
select left(col1+' ',patindex( '%[^0-9]% ',col1+' ')-1) as col from t
/*
col
3
1
4
12
4
*/


如果是无规则字符串中的截取数字请参考以上方法