Need a regex_match checks if word doesn't starts with letters R or W and contains 4 letters and 3 numbers

I need a match if in my text column I can find a word that contains 4 caracters followed with 3 digits, and the word did not started with the letter R or W (if possible on Postgresql)

I have made already a regexp_match, but it doesn't figured out what i need.

Like :

Here my RegEx Code : (?:[A-Za-z]{3,4}\d{3})

https://regex101.com/r/0DYIDs/2

THX in advance

A

PostgreSQL has the ~ operator which precisely does POSIX regexp matching.
To make sure your code is an isolated word, make it preceded by a \s (whitespace) and followed by a (?:\s|$) (non capturing parentheses, for either whitespace or the end of the text):

select *, case when label ~ '\s[A-QS-VX-Za-qs-vx-z][A-Za-z]{3}\d{3}(?:\s|$)' then 'OK' else 'KO' end result from t;

(play with it in this fiddle)