对于您要做什么，我还是不太清楚，但

I am a little unclear on what you are trying to do but

1

RewriteRule    ^([a-z|-]+)(\d+\.html)$    /sub-folder/topic$2    [NC,L]  

将采用第二组(仅273.html)并进行相应附加，第一组将为 之前的所有内容(topic-titles-here-t)

Would take the second group (just 273.html) and append accordingly, the first group would be everything before (topic-titles-here-t)

这是您所需要的吗?如果可以，则可以对正则表达式进行整理，我只想演示这两个组

is that what you require? If so the regex could be tidied I just wanted to demonstrate the two groups

更新-确定，根据编辑，第二组变为

update - Ok according to edit the second group just becomes

(\d{3}-\d+\.html)

如果在此示例中使用的273可以大于3个数字，如果您知道确切的话，只需修改该数字，否则请使用+

if 273 used in this example can be longer than 3 nubers if you know exact just amend that number otherwise use +