Okay now I really need to get some sleep. Just noticed in the Find and Replace plugin that it allows for regex.
A very quick test and I came up with this :
{exp:replace find="&(?!lt;|rt;|amp;)" replace="&" regex="yes"}
<a href="http://www.example.com?test=one&two=two&three=three">http://www.example.com?test=one&two=two&three=three</a>
{/exp:replace}
{exp:replace find="&(?!lt;|rt;|amp;)" replace="&" regex="yes"}
{event_map_url}
{/exp:replace}Seems to do the trick I think. I’m off to bed now. hope it helps.
Best wishes,
Mark