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

Try this:

UPDATE testing SET val=REPLACE(val,SUBSTRING(val,1,LOCATE('-',val)),'4-');

Fiddle here :https://www.db-fiddle.com/f/4mU5ctLh8NB9iKSKZF9Ue2/2

Using LOCATE to find '-' position then use SUBSTRING to get only the front part of the '-'.