字段a                       字段。。。。
                2.3
                12.33
                &11.3
                中文字24.3中文字
                22.02
                NULL
                0.7-1.0
                6.2
        

                字段a                       字段。。。。
                2.3
                12.33
                [color=#FF0000]11.3[/color]
                [color=#FF0000]24.3[/color]
                22.02
                NULL
                [color=#FF0000]1.0[/color]
                6.2
        

--提取非汉字
IF OBJECT_ID('dbo.fn_china_word') IS NOT NULL
DROP FUNCTION dbo.fn_china_word
GO
CREATE FUNCTION dbo.fn_china_word(@S NVARCHAR(100))
RETURNS VARCHAR(100)
AS
BEGIN
WHILE PATINDEX('%[吖-座]%',@S) > 0---去掉 ^ 就是取非汉字
SET @S = STUFF(@S,PATINDEX('%[吖-座]%',@S),1,N'')
RETURN @S
END
GO

if object_id('[Test]') is not null drop table [Test]
go
create table [Test]([字段a] nvarchar(30))
go
insert into [Test]
select '2.3' union all
select '12.33' union all
select '&11.3' union all
select N'中文字24.3中文字' union all
select '22.02' union all
select NULL union all
select '0.7-1.0' union all
select '6.2'

select case when [字段a] like '%&%' then '[color=#FF0000]'+replace([字段a],'&','')+'[/color]'
       when [字段a] like '%[吖-座]%' then '[color=#FF0000]'+dbo.fn_china_word([字段a])+'[/color]'
       when [字段a] like '%-%' then '[color=#FF0000]'+substring([字段a],charindex('-',[字段a])+1,len([字段a])-charindex('-',[字段a]))+'[/color]' else [字段a] end
from [Test]

/*

(8 row(s) affected)

----------------------------------------------------------------------------------------------------------------
2.3
12.33
[color=#FF0000]11.3[/color]
[color=#FF0000]24.3[/color]
22.02
NULL
[color=#FF0000]1.0[/color]
6.2

(8 row(s) affected)


*/