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or doesn't copy paste the HTTP colon SL
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slash or an htps colon slash right
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honestly you and I are not in the habit
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generally of even typing the protocol
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anymore nowadays you just let the
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browser figure it out for you and
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automatically add it instead so this
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one's going to look like more of a
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mouthful but if I want this whole thing
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here in blue to be optional it's
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actually the same solution as Maria
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offered a moment ago I'm going to go
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ahead and put a parenthesis over here
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and a parenthesis after the two slashes
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and then
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a question mark so it's to make that
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whole thing optional as well and this is
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okay it's totally fine to make this
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whole thing optional or inside of it
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this little thing just the S optional as
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well so long as I'm applying the same
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principles again and again either on a
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small scale or a bigger scale it's
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totally fine to Nest one of these inside
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of the
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other questions now on any of these
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refinements to this parsing this
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analyzing of Twitter what if we put a
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vertical bar besides this www do what if
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we use a a vertical bar there so we
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could do something like that too we
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could do something like this uh instead
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of the question mark I could do www. or
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nothing and just leave that in the
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parenthesis that too would be fine I
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personally tend not to like that because
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it's a little less obvious to me wait a
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minute is that deliberate or did I
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forget to finish my thought by putting
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something after the vertical bar but
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that too would be allowed there as well
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if that's what you mean other questions
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on where we left things here where we
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made the protocol optional too what
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coulden if we have parenthesis and
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inside we have another parenthesis and
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another parenthesis interfere with each
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other if you have parentheses inside of
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parenthesis that too is totally fine and
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indeed that should be one of the
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reassuring lessons today as complicated
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4.4
as each of these regular Expressions as
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it admittedly gotten I'm just applying
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the exact same principles and the exact
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same syntax again and again so it's
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totally fine to have parenthesis inside
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of parentheses if they're each solving
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different problems and in fact the
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lesson I would really emphasize the most
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today is that you will not be happy if
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you try to write out a whole complicated
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5
regular expression all at once like if
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you're anything like me you will fail
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4
and you will have trouble finding the
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mistake because my God look at these
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things they are even to me all these
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years later cryptic the better way I
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would argue whether you're new to
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programming or as old to it as I am is
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to just take these baby steps these
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incremental steps where you do something
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simple you make sure it works you add
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one more feature make sure it works add
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one more feature make sure it works and
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hopefully by the end because you've done
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each of those steps one at a time the
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whole thing will make sense to you but
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you'll also have gotten each of those
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steps correct um at each turn so please
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do avoid the inclination to try to come
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up with long sophisticated regular
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Expressions all at once because it's
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just not a good use of a time if you
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then stare at it trying to find a
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mistake that you could have caught if
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you did things more incrementally
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instead all right there Still Remains
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arguably at least one problem with this
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solution in that even though I'm calling
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re.sub to substitute the URL with
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nothing quote unquote I then on my final
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line of code line six I'm just blindly
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assuming that it all worked and I'm
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going to go ahead and print out the
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username but what if the user if I clear
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my screen here and run python of
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twitter. doesn't even type a Twitter URL
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what if they do something like
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https
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www.google.com like completely
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