Counting the number of occurrences of a substring within a string in PostgreSQL

Question

How can I count the number of occurrences of a substring within a string in PostgreSQL?

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Example:

I have a table

CREATE TABLE test.\"use         


        

Answer 1

Occcurence_Count = LENGTH(REPLACE(string_to_search,string_to_find,'~'))-LENGTH(REPLACE(string_to_search,string_to_find,''))

This solution is a bit cleaner than many that I have seen, especially with no divisor. You can turn this into a function or use within a Select.
No variables required. I use tilde as a replacement character, but any character that is not in the dataset will work.