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user's input but everything to the left
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per this new syntax cannot be an at sign
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it can be anything but one or more times
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and everything to the right of the at
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sign can be anything but an at sign one
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or more times followed by lastly a
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literal. edu so again the new syntax is
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quite simply there
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square brackets allow you to specify a
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set of characters that you literally
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type out at your keyboard a b CDE e f or
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the complement the opposite the carrot
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symbol which means not and then the one
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or more symbols you want to
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exclude questions now on this syntax
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here so right after add sign can we use
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the curly brackets M uh one so that we
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can only have one repetition of the add
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symbol absolutely so we could do this
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let me go ahead and pull a VSS code and
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let me delete the current form of a
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regular expression and go back to where
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we began which was justar at andar I
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could absolutely do something like this
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and require that I want at least one of
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any character here and then I could do
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something more to have any more as well
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so the curly brace syntax which we saw
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on the slide earlier but didn't yet use
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absolutely can be used to specify a
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specific number of characters but
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honestly this is more verbose than is
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necessary the best solution arguably or
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the simplest at least ultimately is just
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to say plus but there too another
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example of how you can solve the same
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problem multiple ways let me go back to
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where the regular expression just was
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and take other questions as well
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questions on these sets of characters or
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complimenting that's set so can you use
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that same syntax to say that you don't
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want a certain character throughout the
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whole string you could it's going to be
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uh you could absolutely use the same
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character to exclude
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um you could absolutely use this syntax
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to exclude a certain character from the
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entire string but it would be a little
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harder right now because we're still
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requiring doedu at the end but yes
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absolutely other questions what happens
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if the user inputs do edu in the
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beginning of the string a good question
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what happens if the user types in edu at
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the beginning of the screen well let me
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go back to vs code here and let's try to
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solve this in two different ways first
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let's look at the regular expression and
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see if we can infer if that's going to
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be tolerated well according to the
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current cryptic regular expression I'm
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saying that you can have any character
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except the at sign so that would work I
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could have the dot for the edu but then
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I have to have an at sign so that
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wouldn't really work because if I'm just
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typing in.edu we're not going to pass
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that constraint so now let me try this
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in uh by running the program let me type
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in just literally doedu that doesn't
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work but but but I could do this doedu
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at.edu that too is invalid but let me do
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this uhedu
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something. edu that passes so it's
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starting to get a little weird now maybe
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it's valid maybe it's not but I think
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we'll eventually be more precise too how
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about one more question on this regular
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expression and these complimenting of
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sets can we use uh another domain name
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as a string input can you use another
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domain name absolutely I'm using my own
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just for the sake of demonstration but
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you could absolutely use any domain or
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top level domain and I'm using edu which
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is very us-centric but this would
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absolutely work exactly the same for any
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top level domain all right let me go and
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ahead now and propose that we improve
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this regular expression further because
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if I pull it up again in V vs code here
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you'll see that I'm being a little too
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tolerant still it turns out that there
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are certain requirements for someone's
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username and domain name in an email
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address there is an official standard in
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the world for what an email address can
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be and what characters can be in it and
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this is way too accommodating of all the
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