In MySQL use the ‘^’ to identify you want to check the first char of the mysql table filed then you can do like below example.
SELECT * FROM `table_name` WHERE field_name REGEXP '^a'
If you want to check more then a alfa letters of the string then define the array  of letters you want to check then have look below code.
SELECT * FROM `table_name` WHERE field_name REGEXP '^[abc]'
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