MySQL Case in Select Statement with LIKE operator

Question

Is it possible to combine the CASE statement and the LIKE operator in a MySQL SELECT statement?

For Example, I am trying to query

Answer 1

Perhaps use LEFT()?

SELECT
    CASE 
      WHEN LEFT(digits, 4) = '6901' THEN substr(digits,4)
      WHEN LEFT(digits, 2) = '91' THEN substr(digits,2)
    END 
FROM raw

Should be more performant than the LIKE.