@Suhag Pandya
You can use instr function in hive to return the first occurance of the substring in your string.
select instr(string str, string substr);
Example:-
hive> select instr('foobar','o'); //returns first position of o in foobar string
+------+--+
| _c0 |
+------+--+
| 2 |
+------+--+To return the first position of the substring from nth position in your string then use locate function in hive
Example:-
hive> select locate('o','fooobar',4);//returns the first occurance from 4th position
+------+--+
| _c0 |
+------+--+
| 4 |
+------+--+For case insensitive use lower function with locate function
Example:-
hive> select locate('o',lower('FOOOBAR'),4);
+------+--+
| _c0 |
+------+--+
| 4 |
+------+--+There is no built in function that can gives your nth occurrence and match regex of the substr in hive yet, but you can create UDF for this functionality in hive.
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