How to distinguish a search query from a website address?

Question

Android

I am making an application in which there is one text field for url and search query (as in Chrome), how to correctly distinguish the first from the second, given that the user can enter url without http:// ?

Answer 1

I decided it works fine, on objective-c this regular expression looks like this:

NSString *pattern = @"^(?i)(?:(?:https?|ftp):\\/\\/)?(?:\\S+(?::\\S*)[email protected])?(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))(?::\\d{2,5})?(?:\\/[^\\s]*)?$";

Answer 2

by regular expression.
You can use the list of all first-level domain zones.

Answer 3

show an example of your search query with a website address

Answer 4

Resolve in DNS what the user entered into the string. If sobered up - most likely, some kind of site.
You can make a HEAD request to be sure.