import re
twitter_urls = [
    "https://w...content-available-to-author-only...r.com/sachin",
    "https://w...content-available-to-author-only...r.com/@sachin",
    "https://w...content-available-to-author-only...r.com/@sachin",
    "https://w...content-available-to-author-only...r.com/sachin?lang=en"
]
 
for twitter_url in twitter_urls:
    match = re.search(r'^.*?\btwitter\.com/@?(\w{1,15})(?:[?/,].*)?$',twitter_url)
    if match:
        print(match.group(1))  

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