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Nesting two extensions gives some strange results. With two extensions, each
returning "This is extension # and i was passed'" . $text ."'"; the following
wikitext fragment 

<ext1> Extension one alone </ext1>

<ext2> Extension two alone </ext2>

<ext1> Extension one including  ext2: '<ext2> Extension two inside extension1
</ext2>' </ext1>

<ext2> Extension two including  ext1: '<ext1> Extension one inside extension2
</ext1>' </ext2>

The resulting text is not quite what is expected:

This is extension1 and I was passed ' Extension one alone '

This is extension2 and I was passed ' Extension two alone '

This is extension1 and I was passed ' Extension one including ext2: ' Extension
two inside extension1 ' '

This is extension2 and I was passed ' Extension two including ext1: 'This is
extension1 and I was passed ' Extension one inside extension2 '' '