PL-SQL INSTR ( indexof )

INSTR('Tech on the net', 'e')
Result: 2   (the first occurrence of 'e')

INSTR('Tech on the net', 'e', 1, 1)
Result: 2   (the first occurrence of 'e')

INSTR('Tech on the net', 'e', 1, 2)
Result: 11  (the second occurrence of 'e')

INSTR('Tech on the net', 'e', 1, 3)
Result: 14  (the third occurrence of 'e')

INSTR('Tech on the net', 'e', -3, 2)
Result: 2
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