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I try to match root of domain name with regular expressions in JS. I have a problem when path hasn't www. in himself.
For example, i tried match from this string:
(http://web.archive.org/web/20080620033027/http://www.mrvc.indianrail.gov.in/overview.htm)
Thats regex what i try is presented below. I try him on regex101.com
/(?<=(\/\/(www\.)|\/\/)).+?(?=\/)/g
I expect the output array with names web.archive.org and mrvc.indianrail.gov.in but get web.archive.org and www.mrvc.indianrail.gov.in with www. in second case.
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The valid domain name must satisfy the following conditions: The domain name should be a-z or A-Z or 0-9 and hyphen (-). The domain name should be between 1 and 63 characters long. The domain name should not start or end with a hyphen(-) (e.g. -geeksforgeeks.org or geeksforgeeks.org-).
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Short for regular expression, a regex is a string of text that lets you create patterns that help match, locate, and manage text. Perl is a great example of a programming language that utilizes regular expressions. However, its only one of the many places you can find regular expressions.
What about this regex:
(?<=https?:\/\/(?:www\.)?)(?!www\.).+?(?=\/)
it matches web.archive.org and mrvc.indianrail.gov.in without the www.
demo: https://regex101.com/r/5ZqK7n/3/
Differences with your initial regex:
s? to support https: URLs (remove it if not necessary)(?:www\.)? can appear 0 to 1 time
After the lookbehind you add a negative lookahead (?!www\.) to not match, to avoid that your .+? matches the initial www.
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