Workflow Conditions using strings

What I want to do is use a Condition in a Workflow as an IF statement which checks some GV strings which contain either "Yes" or "No". If the string contains "Yes" then it will be added to an email which will be sent after the Condition task is completed. Does anyone know how to have a Condition check a string for a specified value?

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Use VBA's InStr -method in the condition's arithmetic expression to check if a substring occurs in another string.