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CREATE TABLE YourTable ( Code VARCHAR(50) ) INSERT YourTable VALUES (''), (NULL), ('1JAN99'), ('2FEB00'), ('3MAR01'), ('4APRIL02'), ('5APRIL007'), ('2JAN 22') SELECT * FROM YourTable WHERE CASE WHEN Code LIKE '[0-9]%[^ ][0-9][0-9]' THEN SUBSTRING(Code, 2, LEN(Code) - 3) END IN ( 'JAN', 'FEB', 'MAR', 'APRIL' )
Code
1JAN99
2FEB00
3MAR01
4APRIL02