PostgreSQL substring get string between brackets

Question

I have a string, say:

Product Description [White]

I want to extract anything inside the brackets (in this case White) from that str

Answer 1

i think you want to update some value like grade pay from pay scale or any thing just use following query

UPDATE master.pay_scale SET grade_pay= Case When description LIKE '%(%)%' Then (select substring(description from '((.+))')) else description End::numeric

Answer 2

(.) only matches a single character, but you want to match multiple characters in there.

So you need (.+)

substring('Product Description [White]' from '\[(.+)\]')