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right one or more times how about one
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other question on these regular
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Expressions perfect so I was going to
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ask um does the back slw um include a
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DOT uh because no nope it only includes
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letters numbers uh and underscore that
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is it and I was wondering you gave an
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example at the beginning that had uh
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spaces like this is my email so on so um
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I don't think our current version even
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quite quite a long while ago stopped
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accepting it was that because of the
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carrot uh
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or because of something no the reason I
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was handling spaces and other English
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words when I typed out my email address
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as mailin at harvard.edu was because we
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were using initially star or plus which
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is any character
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uh and even after that we said anything
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except the at sign which includes spaces
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only once I started using square
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brackets and a through z and 0 through 9
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and underscore did we finally get to the
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point where we would reject wh space and
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in fact I can run this here let me go
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into the current version of my code in
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VSS code which is using again the back
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WS for word characters let me run python
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of validate and incorrectly type in
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something like my email address is maen
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harvard.edu period which has spaces to
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the left of my username and that is now
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invalid because space is not a word
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character yorgo notes too that
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technically I'm not allowing dots and
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some of you might be thinking wait a
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minute my gmail address has a dot in it
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that's something we're going to still
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have to fix a back slw is not the end
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all here it's just allowing us to
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express our previous solution a little
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more succinctly now one thing we're
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still not handling quite properly is
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uppercase versus lowercase the back slw
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technically does handle lowercase
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letters and uppercase because it's the
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exact same thing as that set from before
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which had little a through little Z and
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big a through big Z but watch this let
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me go ahead and my current form run
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python to validate dopy and just because
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my caps slot key is down maen
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harvard.edu shouting my email address
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it's going to be okay in terms of the ma
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it's going to be okay in terms of the
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Harvard because those are matching the
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back slw which does include lowercase
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and uppercase but I'm about to see
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invalid why why is mail at harvard.edu
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invalid when it's in all caps here even
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though I'm using
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backw yeah so you are asking for the
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domain. edu in lowercase and you're
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typing it in an uppercase exactly I'm
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typing in my email address in all
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uppercase but I'm looking for literally
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edu and as I see you with airpods and so
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many of you with headphones I apologize
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for yelling into my microphone just now
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to make this point but let's see if we
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can't fix that well if my pattern on
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line five is expecting it to be
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lowercase there's actually a few ways I
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can solve this one would be something
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we've seen before I could just force the
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user's input to all lowercase and I
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could put onto the end of my first line
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do lower and actually force it all to
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lowercase alternatively I could do that
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a little later instead of passing in
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email I could pass in the lowercase
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version of email because email addresses
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should in fact be case insensitive so
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that would work too but there's another
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mechanism here which is worth seeing it
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turns out that that function before
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called re. search supports recall a
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third argument as well these so-called
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flags and flags are configuration
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options typically to a function that
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allow you to configure it a little
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differently and how might I go about
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configuring this call to re. search a
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little bit differently in so far as I'm
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currently only passing in two arguments
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well it turns out that some of the flags
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you can pass into this function are
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these it turns out that the regular
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expression library in Python AKA re
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