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You can use the position or charindex functions.
dev=# select position('SUBSTR(' in 'jakjasf;kljksfjdsSUBSTR(kjasdkjadsjfjk');
position
----------
18
(1 row)
dev=# select charindex('SUBSTR(', 'jakjasf;kljksfjdsSUBSTR(kjasdkjadsjfjk');
charindex
-----------
18
(1 row)
