navigator.userAgent for non Smart devices

It is simple to detect the smart device from navigator.userAgent

like navigator.userAgent.match(/iPhone/i) , navigator.us开发者_StackOverflow中文版erAgent.match(/Android/i), etc.

How do i get know that a request came from a system ( non smart device ) like from desktop, laptop,etc. using navigator.userAgent.

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You can test the userAgent value for the names of popular browsers! For example, the user agent string for the latest version of Firefox looks like this:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2

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Browser detection is bad. It's always better to opt for feature detection instead.