finding contents from string

[danin]

Hi all,
        I am looking for particular solution. I am having one string
say:
string- "http://maps.google.co.in/maps/ms?
hl=en&ie=UTF8&msa=0&msid=106178526636832397420.00047fb46fa8d02481f09&ll=20.730428,86.456909&spn=2.178194,3.526611&z=8
"
          and from this string  i need to extract value
-20.730428,86.456909. These value are dynamic so i cant use filter. So
can anyone please tell me about how to do this.