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Hello gpt2-qa
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import re
URL_REGEX = re.compile(
r"(?:^|(?<![\w\/\.]))"
# protocol identifier
# r"(?:(?:https?|ftp)://)" <-- alt?
r"(?:(?:https?:\/\/|ftp:\/\/|www\d{0,3}\.))"
# user:pass authentication
r"(?:\S+(?::\S*)?@)?" r"(?:"
# IP address exclusion
# private & local networks
r"(?!(?:10|127)(?:\.\d{1,3}){3})"
r"(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})"
r"(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})"
# IP address dotted notation octets
# excludes loopback network 0.0.0.0
# excludes reserved space >= 224.0.0.0
# excludes network & broadcast addresses
# (first & last IP address of each class)
r"(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])"
r"(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}"
r"(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))"
r"|"
# host name
r"(?:(?:[a-z\\u00a1-\\uffff0-9]-?)*[a-z\\u00a1-\\uffff0-9]+)"
# domain name
r"(?:\.(?:[a-z\\u00a1-\\uffff0-9]-?)*[a-z\\u00a1-\\uffff0-9]+)*"
# TLD identifier
r"(?:\.(?:[a-z\\u00a1-\\uffff]{2,}))" r"|" r"(?:(localhost))" r")"
# port number
r"(?::\d{2,5})?"
# resource path
r"(?:\/[^\)\]\}\s]*)?",
# r"(?:$|(?![\w?!+&\/\)]))",
# @jfilter: I removed the line above from the regex because I don't understand what it is used for, maybe it was useful?
# But I made sure that it does not include ), ] and } in the URL.
flags=re.UNICODE | re.IGNORECASE,
)