Phyton Regular Expression help, pls

Need help writing a regular expression:

I need a regexp to match a URL, so I need to include all URLs that have a 'hello' in them and exclude all URLs that have 'bye' in them, in other words,
need a regexp that matches .*hello.* but does not match .*bye.*

NOTE: I replaced the super-secret  words with 'hello' and 'bye' ;)
I promise this is not a homework, I just suck with Regular Expressions and could not find online the exclude pattern
Thanks!
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GulaAsked:
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GulaConnect With a Mentor Author Commented:
.*hello(?!.*bye.*)
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