正则表达式匹配模式，除非它与特定字符串结束

Question

I'm having a little trouble coming up with a regex for my particular situation. This is what I have.

"#<call:(\d+)>(?:(?!\/MM).)+?(\s+)?(?=\<)#ims"

I need to match the following example.

<call:5>anything <

But I don't want to match this...

<call:5>anything/mm <

That's working ok, but the problem is that it won't match this...

<call:5>anything/mmm <

I need the regex to match anything provided anything does not end with /mm. I know it's going to be something small I'm overlooking, but could you point out what I'm doing wrong please?

Answer 1

If one can assume that the call tag contents to be matched will not contain

• spaces after an (allowed?) /mm string or
• < characters (except at the end),

the following seems to work:

<call:(\d+)>(?:(?!\/mm[\s<]).)+?(\s+)?(?=\<)

EDIT:

I think the corner cases can be solved as well, try this instead:

<call:(\d+)>(?:(?!\/mm\s*?<).)+?(\s+)?(?=\<)