如果对表值函数开放，请考虑以下事项。
厌倦了提取字符串（left、right、charindex、patindex、reverse 等），我修改了一个 split/parse 函数来接受两个不同的分隔符。在这种情况下> 和</
此外，作为 TVF，如果您的数据在表格中，则很容易将其合并到 CROSS APPLY 中。
示例
Declare @S varchar(max)='<HTML><HEAD><style type="text/css">BODY,TD,TH,BUTTON,INPUT,SELECT,TEXTAREA{FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial,Helvetica;}BODY{MARGIN: 5px;}P,DIV,UL,OL,BLOCKQUOTE{MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px;}</style></HEAD><BODY> <p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px">Patient is a 84 year old female. Patient''s histpry includes the following:</p> <p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"> </p></BODY></HTML>'
Select *
From [dbo].[tvf-Str-Extract](replace(@S,' ',' '),'>','</')
Where RetVal<>' '
and RetVal not like 'BODY,%'
退货
RetSeq RetPos RetVal
2 284 Patient is a 84 year old female. Patient's histpry includes the following:
注意： WHERE 是可选的，可能需要根据您的实际需要进行调整。只是为了好玩，在没有 WHERE 的情况下尝试一下。另外，在这个例子中，我们捕获了&nbsp;，但如你所知，可能还有很多其他的，例如&mdash;。
感兴趣的功能
CREATE FUNCTION [dbo].[tvf-Str-Extract] (@String varchar(max),@Delimiter1 varchar(100),@Delimiter2 varchar(100))
Returns Table
As
Return (
with cte1(N) As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
cte2(N) As (Select Top (IsNull(DataLength(@String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 N1,cte1 N2,cte1 N3,cte1 N4,cte1 N5,cte1 N6) A ),
cte3(N) As (Select 1 Union All Select t.N+DataLength(@Delimiter1) From cte2 t Where Substring(@String,t.N,DataLength(@Delimiter1)) = @Delimiter1),
cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(@Delimiter1,@String,s.N),0)-S.N,8000) From cte3 S)
Select RetSeq = Row_Number() over (Order By N)
,RetPos = N
,RetVal = left(RetVal,charindex(@Delimiter2,RetVal)-1)
From (
Select *,RetVal = Substring(@String, N, L)
From cte4
) A
Where charindex(@Delimiter2,RetVal)>1
)
/*
Max Length of String 1MM characters
Declare @String varchar(max) = 'Dear [[FirstName]] [[LastName]], ...'
Select * From [dbo].[tvf-Str-Extract] (@String,'[[',']]')
*/