用一些单词替换可变长度字符串
给定下面的字符串
Declare @string varchar(max)='abc ___________ deffns ___ cg _ hif _______hh ihs';
这是所需的输出:(每个连字符，无论长度如何，都应替换为姓氏)
this is the Output required : (Every hypen irrespective of length should be replaced with lastname)
abc lastname deffns lastname cg lastname hif lastname hh ihs
这里的问题是，可以有很多可变长度的Hypens(最大长度可以是<20)...
The issue here is, there can be many Hypens of variable length(max length can be <20)...
我尝试了许多方法，并使用以下方法解决..
I tried with many methods and settled with below approach..
select
REPLACE(REPLACE(replace(stringcol,replicate('_',20),'LASTNAME'),
replicate('_',19),'LASTNAME'),
replicate('_',18),'LASTNAME')
from table
有没有办法有效地做到这一点..任何建议将是最受欢迎的
Is there a way to do accomplish this efficiently..any advice would be most welcome
推荐答案
先去掉多个下划线，再进行替换.
First get rid of the multiple underscores, then do the replace.
这是一种方法:
select replace(replace(replace(@string, '_', '><'
), '<>', ''
), '><', 'LASTNAME'
)
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