How to find the first and last occurrences of a specific character inside a string in PostgreSQL

Question

I want to find the first and the last occurrences of a specific character inside a string. As an example, consider a string named \"2010-####-3434\", and suppose the charact

Answer 1

My example:

reverse(substr(reverse(newvalue),0,strpos(reverse(newvalue),',')))

1. Reverse all string
2. Substring string
3. Reverse result