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characters in the world except for the
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at symbol so let's actually narrow the
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definition of what we're going to
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tolerate in usernames and companies like
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Gmail could certainly do this as well
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suppose that it's not just that I want
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to exclude at sign suppose that I only
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want to allow for say characters that
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normally appear in words like letters of
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the alphabet A through Z be it uppercase
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or lowercase maybe some numbers in heck
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maybe even an underscore could be
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allowed to well we can use this same
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square bracket syntax to specify a set
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of characters as follows I could do a b
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c d e f g h i j oh my God this is going
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to take forever I'm going to have to
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type out all 26 letters of the alphabet
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both lowercase and uppercase so let me
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stop doing that there's a better way
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already if you want to specify Within
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These square brackets a range of letters
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you can actually just do a hyphen if you
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literally do a hyphen Z in these square
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brackets the computer is going to know
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you mean a through z you do not need to
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type 26 letters of the alphabet if you
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want to include uppercase letters as
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well you just do the same no spaces no
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commas you literally just keep typing a
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through capital Z so I have little a
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hyphen little Z big a hyphen big Z no
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spaces no commas no separators you just
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keep specifying those ranges if I
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additionally want numbers I could do 0 1
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2 3 4 NOP you don't need to type in all
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10 decimal digits you can just say 0
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through n using a hyphen as well and if
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you now want to support underscores as
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well which is pretty common in user
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names for email addresses you can
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literally just type in underscore at the
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at the end notice that all of these
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characters are inside of square brackets
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which just again means here is a set of
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characters that I want to allow I have
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not used a carrot symbol at the
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beginning of this whole thing because I
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don't want to complement it complement
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it with an E not complement it with an i
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I want don't want to complement it by
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making it the opposite I literally want
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to accept only these characters I'm
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going to go ahead and do the same thing
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on the right if I want to require that
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the domain name similarly come from this
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set of characters which admittedly is a
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little too narrow but it's familiar for
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now so we'll keep it simple I'm going to
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go ahead and paste that exact same set
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of characters over there to the right
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and so now it's much more restrictive
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now I'm going to go ahead and run python
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of validate I'm going to test my own
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email address and we're still good I'm
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going to clear my screen and run it once
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more this time trying to break it let me
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go ahead and do something like how about
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davidor maen harvard.edu enter but that
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too is going to be valid but if I do
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something completely wrong again like ma
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harvard.edu that's still going to be
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invalid why because my regular
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expression currently only allows for a
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single at in the middle because
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everything to the left must be alpha
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numeric alphabetical or numeric or an
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underscore the same thing to the right
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followed by the edu now honestly this is
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a regular expression that you might be
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in the habit of typing in the real world
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as in as cryptic as this might look this
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is the world of regular Expressions so
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you'll get more comfortable with this
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syntax over time but thankfully some of
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these patterns are so common that there
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are builtin shortcuts for representing
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some of the same information that is to
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say you don't have to constantly type
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out all of the symbols that you want to
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include because odds are some other
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programmer has had the same problem so
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built into regular Expressions
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themselves are some additional patterns
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you can use and in fact I can go ahead
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and get rid of this entire set a through
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z lowercase A through Z uppercase 0
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through 9 in an underscore and just
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replace it with a single back slw back
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slw in this case represents a word
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