matching n'th pattern...

Hello !

I'm trying to get text between given html tags, for examle for this
pattern:

foo<li>a</li><li>b</li><li>c</li>bar

I'd like to get
a for parameter 1
b for parameter 2
c for parameter 3

What I've tried so far is this:

echo 'foo<li>a</li><li>b</li><li>c</li>bar' |  gawk
'{ b=gensub("(.*)<li>([^</li>]*)</li>(.*)","\\2",X) ; print b }'

but it returns c no matter of X value, could you help me please?