regexp_instr (string, pattern)
regexp_instr (string, pattern, position)
regexp_instr (string, pattern, position, occurence)
regexp_instr (string, pattern, position, occurence, return-option)
regexp_instr (string, pattern, position, occurence, return-option, parameters)
parameters can be a combination of
* i: to match case insensitively
* c: to match case sensitively
* n: to make the dot (.) match new lines as well
* m: to make ^ and $ match beginning and end of a line in a multiline string
* x: to ignore white spaces.
regexp_instr is an Oracle SQL function that enables regular expressions in queries.
It enhances the 'traditional' instr.