If you know exactly the lines you're looking for you can just enter them and look for them? If the line matches, just return the value of $nohtml(%read)
Code:
on *:sockread:SOCKNAME: {
  var %read 
  sockread -f %read
  if (<td width="80" height="14%" bgcolor="#D7EBFF"><div align="center"><span class="Estilo24"><span class="Estilo31"> isin %read) set %tok %tok $nohtml(%read)
  elseif (<td width="59" height="86"><span class="Estilo7"> isin %read) set %tok %tok $nohtml(%read)
  elseif (<div align="center" class="Estilo24"> isin %read) set %tok %tok $nohtml(%read)
}
on *:sockclose:SOCKNAME: { 
  if (%tok) msg $gettok($sock($sockname).mark,3,32) %tok
  unset %tok
}

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