cat page.txt | sed 's/;/\n/g'| sed 's/:/\n/g'|awk {'print "<a href=mysite.net/"$1" >"$1"</a>"'}

##</code><code>##

out=~s/;/\n/;
out=~s/:/\n/;
print "<a href=mysite.net/"$out" >"$out"</a>";