[sql-server] Check if a string contains a substring in SQL Server 2005, using a stored procedure

I've a string, @mainString = 'CATCH ME IF YOU CAN'. I want to check whether the word ME is inside @mainString.

How do I check if a string has a specific substring in SQL?

You can just use wildcards in the predicate (after IF, WHERE or ON):

@mainstring LIKE '%' + @substring + '%'

or in this specific case

' ' + @mainstring + ' ' LIKE '% ME[., ]%'

(Put the spaces in the quoted string if you're looking for the whole word, or leave them out if ME can be part of a bigger word).