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求一段正则替换.该如何处理

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Release： 2016-06-13 13:33:29
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求一段正则替换..
A-1要删除的内容B-1
需要保留的内容
A-2要删除的内容B-2
需要保留的内容
A-4要删除的内容B-4
需要保留的内容
A-3要删除的内容B-3
需要保留的内容
A-8要删除的内容B-8
.
.
.
需要保留的内容
A-n要删除的内容B-n


其中 n = 正整数 ,内容里会包含html标签,也包含换行等等...
求大虾指教.

------解决方案--------------------
/A-\d.*?B-\d/

Related labels：
html
source：php.cn
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