Regex extraction of URL

Question

for example, I have:

String a = abcd http//google.com abcd

and

String b=efgh http//yahoomail.hey.com ihklm

How can I extract only the words:

google
yahoomail.hey
TIA

Answer 1

Try this

        string pattern = @"//[a-zA-Z0-9]{1,}[.][a-zA-z]{2,4}";
        string input = @"http//yahoomail.hey.com ihklm";

        foreach (Match m in Regex.Matches(input, pattern))
        {
            Console.WriteLine("'{0}'", m.Value.ToString().Replace("/",""));
        }

Explaination:

// The match needs to start with "//"

[a-zA-Z0-9]{1,} next there can be any amount of characters specified in[ ] 1 to n times

[.] then there needs to be a .

[a-zA-z]{2,4} the domain can be any Upper/lower character and there need to be at least 2 but max 4 characters

to check your Regexes, i suggest using https://regex101.com/
use the standard settingswith PHP flavour. after you are finished creating the Regex, you can use "Code generator" on the left to convert it to JScript/php/python/c#/java/ruby/rust/perl/golang