what does a strfind return?

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Hi, I am new to Matlab

I am tring to use strfind function to compare a small string with a longer string. I have read the help strfind page, I know it returns either [] empty array or a number (indicate the position the small string matches the longer string). I want to write an if statement after that, something like if the return string is not [] empty or have a value in it. I dont care what value, as long as the return has a value. This is part of my code

for k=1:length(Textdata)
        S = strfind(Textdata(k),InputName);
        if(S~=null)  %this is not right, I dont know how to correct it
            FigureIndex=k;
            ...
        end 
end
Can someone please give me some help?