Se;
To search for a substring in a string (let say, the string is "Have a good day" and you are searching for the word "good"), you can use the VI
Search/Split String located in the "Strings -> Additional String Functions" palette. Test the value of the output "offset of match". If the value is less than 0, then the substring is not part of the string.
However, "search for a string" can mean several things. We can provide you with better advice if you can provide an example of what you want.
Regards;
Enrique
www.vartortech.com