How to find out index of string

Hi,
Can you help me to find out index of following strting.
"sss.xxxxx_pain.001.001.02_1002225618.xml"
need to get value "1002225618".
ideally i need to get the value inbetween after second "_"  and value before ".xml".
Thanks
Mahi

Hi Mahi,
UDF should be like this:
If you do not want .xml in the out replace statement
var1=var1.substring(sublen+1, len);
with
var1=var1.substring(sublen+1, len-4);
Regards,
Krupa

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