domain.py


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#!/usr/bin/env python3

def url_extract_domain(url):
    index = 0
    if url.startswith("http://"):
        index += 7
    elif url.startswith("https://"):
        index += 8

    if url.startswith("www.", index):
        index += 4

    end = url.find(".", index)
    if end == -1:
        return url[index:]
    else:
        return url[index:end]