Allow Reg Expressions in Position function

[Nick Dro <postgresql@xxxxxxxxxxx>]

Position function allows only string as pattern parameter:

 

select position(sub-string in string)

 

If you are looking for more than one sub-string you can't do it with a single call to position.

More info: 

https://stackoverflow.com/questions/51925037/how-to-find-position-of-multiple-sub-string-in-postgresql

 

 

Required solution: make sub-string accept regular _expression_ just like the LIKE operator.