Regular expression for validating hostname


24-Oct-2017 05:00

A URL is a good example of something users routinely enter incorrectly.

Consider an application where you read a URL from a config file or some other user-entered location.

If you want to check whether a string is a URL or not. In Java Script, we can have a regular expression like var pattern=/(. ([^\/] )(\/.*)*/i;the regular expression pattern can be used to get the hostname.

This can be called as either a subroutine or a method.How to match the following hostnames with a bash regular expression?



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