One example is hardly enough to guess what it is about that sample that makes it definitively spam?

If the determining pattern is that an open tag is follow by text that is followed by a non-matching close tag, then something like this might work. 

m[ < ( [^>]+ ) > .*? </ (?! \1> ) ]x

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There are probably many ways that this could be improved, but it would require more samples to decide how.

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail

In reply to Re: regex help or pointer to module needed by BrowserUk
in thread regex help or pointer to module needed by Xxaxx

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