How to replace a regex pattern in MySQL

Question

I have a table called myTable which has a column called col1. This column contains data in this format: (1 or 2 digits)(hyphen)(8 digits).

I wa

Answer 1

Looking to your pattern seem you could avoid regexp

update myTable  
set col1  = concat('4-', right(col1,8))

or

update myTable  
set col1  = concat('4', right(col1,9))