Many are asking me about this matter of how to properly validate a number using Regular Expression, so I decided to write this post to share with you from my experience and research. And most important thing that really bothers me, is that the internet is full of examples and solutions for exactly this task, but unfortunately most of them are incorrect or incomplete.

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I spent hours to find out how to do it. And believe me or not, I found nothing on the internet about how to solve it. So I wrote my own solution. It appear that there is a very simple way to achieve this. After the event deviceready has been triggered (as described on the PhoneGap’s API Docs), all you have to do is: When the deviceready event is being triggered, it tell us that all native components are loaded and are ready to use. Which means, that there is no way to determine whether the page was loaded from PhoneGap or not, using the PhoneGap plugin itself. You can always test against browser’s User Agent, but it isn’t a good verification, because it is always possible to open this same page through mobile’s browser, that have the same User Agent as the one that has been loaded from PhoneGap.…

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