function escapedString = string2escape(inString)
% Converts all non alphanumeric characters in inString
% to escape sequences.  For example, '/' becomes '%2F'.
stringLen = size(inString,2);
escapedString = '';
for index = 1:stringLen,
    if(isletter(inString(index)) || inString(index) >= '0' && inString(index) <= '9')
        escapedString = [escapedString inString(index)];
    else
        escapedString = [escapedString '%' dec2hex(double(inString(index)),2)];
    end
end