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and it takes more arguments but they're
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fairly straightforward the first
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argument to re.sub is the pattern the
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regular expression that you want to look
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for then you have a replacement string
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what do you want to replace that pattern
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with and where do you want to do all
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that will you pass in the string that
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you want to do the substitution on then
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there's some other arguments that I'll
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wave my hands up for now among them are
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those same flags and also a count like
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how many times do you want to do find
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and replace do you want it to do all or
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do you want to do it just one or so
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forth you can have further control there
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too just like you would in Google Docs
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or Microsoft Word well let me go back to
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my code here and let me do this I'm
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going to go ahead and call re not search
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but re.sub for substitute I'm going to
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pass in the following regular expression
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https
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col
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twitter.com uh slash and then I'm going
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to close my quote and now what do I want
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to replace that with well like before
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with the simple stir replace function I
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want to replace it with nothing just get
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rid of it all together but what uh
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string do I want to pass in to do this
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to the URL from the user and now let me
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go ahead and assign the return value of
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re sub to a variable called username so
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re sub's purpose in life is again to
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substitute some value for some regular
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expression some number of times it
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essentially is find and replace using
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regular expressions and it returns to
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you the resulting string once you've
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done all those substitutions so now the
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very last line of my code can be the
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same as before print and I'll use an F
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string username colon and then in curly
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braces username so I can print out
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literally just that all right let's try
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this and see what happens I'll clear my
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terminal window run python of twitter.
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and here we go https
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col
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twitter.com davidj Ma
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cross my fingers and hit enter okay now
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we're in business but it is still a
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little fragile and so let me ask the
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group what problem should I now further
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chip away at they've been said before
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but let's be clear what's one or more
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problems that still remain the protocols
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and the uh domain prefixes for good the
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protocol so HTTP versus https maybe the
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subdomain www should it be there or not
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and there's a few other mistakes here
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too let me actually stay with the group
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what are some other shortcomings of this
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current solution um if we use a phrase
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like you do before we are going to have
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the same problem because it's not taken
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account in the first part of the the
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text symbol good I might still allow for
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like some words uh some English to the
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left of the URL because I didn't use
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like my carrot symbol so I'll fix that
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and any final observations on
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shortcomings here uh well the could be a
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HTTP or there could be like less than
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two slashes okay so it could be HTTP and
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I think that was mentioned too in terms
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of protocol there could be fewer than
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two slashes that I'm not going to worry
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about if the user gives me one slash
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instead of two that's really user error
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and I could be tolerant of it but you
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know what at that point I'm okay yelling
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at them with an error message saying
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please fix your input otherwise we could
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be here all day long trying to handle
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all possible typos for now I think in
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the interest of usability or user
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experience ux let's at least be tolerant
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of all possible valid inputs or
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reasonable inputs if you will so let me
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go here and let me start chipping away
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at these here what are some problems we
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can solve well let me propose that we
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first address the issue of matching from
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the beginning of the string so let me
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add the carrot to the beginning and let
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me add not a dollar sign at the end
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though right because I don't want to
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match all the way to the end because I
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