text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
comes with a few built-in variables so | 3,491.24 | 4.16 |
to speak things that you can think of as | 3,493.48 | 5.72 |
constants that have meaning to re. | 3,495.4 | 6.639 |
search and they do so as follows if you | 3,499.2 | 5.68 |
pass in as a flag re. ignore case what | 3,502.039 | 4.961 |
re. search is going to do is ignore the | 3,504.88 | 3.88 |
case of the user's input it can be | 3,507 | 3.319 |
uppercase lower case a combination | 3,508.76 | 3.52 |
thereof the case is going to be ignored | 3,510.319 | 4.201 |
it will be treated case insensitively | 3,512.28 | 3.519 |
and you can do other things too that we | 3,514.52 | 3.279 |
won't do here but if you want to handle | 3,515.799 | 3.8 |
the user's input that maybe spans | 3,517.799 | 3.56 |
multiple lines maybe they didn't just | 3,519.599 | 3.76 |
type in an email address but an entire | 3,521.359 | 4.081 |
paragraph of text and you want to match | 3,523.359 | 3.801 |
different lines of that text that is | 3,525.44 | 4.639 |
multiple lines another flag is for re. | 3,527.16 | 5.72 |
multi-line for just that or re doall | 3,530.079 | 5.081 |
whereby you can con uh you can configure | 3,532.88 | 5.36 |
the DOT to rep to recognize not just any | 3,535.16 | 5.439 |
character except new lines but any | 3,538.24 | 4.839 |
character plus new lines as well but for | 3,540.599 | 4.24 |
now let me go ahead and just make use of | 3,543.079 | 3.841 |
this first one let me pass in a third | 3,544.839 | 5.361 |
argument to re. search which is | 3,546.92 | 7.439 |
re. uh ignore case let me now rerun the | 3,550.2 | 5.839 |
program without clearing my screen | 3,554.359 | 4 |
python of validate dopy let me type in | 3,556.039 | 4.681 |
again in all caps effectively shouting | 3,558.359 | 5.841 |
maen harvard.edu enter and now it's | 3,560.72 | 5.92 |
considered valid because I'm telling re. | 3,564.2 | 4.359 |
search specifically to ignore the case | 3,566.64 | 4.24 |
of the input and that to here is fine | 3,568.559 | 3.961 |
and why might I do this approach rather | 3,570.88 | 3.8 |
than call do lower in one of those other | 3,572.52 | 4.12 |
locations if I don't actually want to | 3,574.68 | 3.76 |
change the user's input for whatever | 3,576.64 | 3.84 |
reason I can still treat it case | 3,578.44 | 4.8 |
insensitively without actually changing | 3,580.48 | 5.76 |
the value of that variable itself all | 3,583.24 | 5.119 |
right any final questions now on this | 3,586.24 | 4.24 |
validation of email | 3,588.359 | 5.881 |
addresses uh so the pattern is a string | 3,590.48 | 8 |
right M uh can use an F string you can | 3,594.24 | 6 |
yes you can use an F string so that you | 3,598.48 | 3.879 |
could plug in for instance the value of | 3,600.24 | 4.64 |
a variable and pass it into the function | 3,602.359 | 4.921 |
other questions on this access W | 3,604.88 | 4.52 |
character could we take it as an input | 3,607.28 | 4.48 |
from the user technically yes that's not | 3,609.4 | 3.8 |
a problem we're trying to solve right | 3,611.76 | 3.279 |
now we want the user to provide literal | 3,613.2 | 3.599 |
input like their email address not | 3,615.039 | 4.241 |
necessarily a regular expression but you | 3,616.799 | 4.161 |
could imagine building software that | 3,619.28 | 3.44 |
asks the user especially if they're more | 3,620.96 | 3.44 |
advanced users to type in a regular | 3,622.72 | 3.92 |
expression for some reason to validate | 3,624.4 | 3.76 |
something else against that and in fact | 3,626.64 | 3.439 |
that's what Google's doing if you play | 3,628.16 | 3.72 |
around with Google forms and create a | 3,630.079 | 4.24 |
form with response validation and select | 3,631.88 | 5.36 |
regular expression Google lets you and I | 3,634.319 | 4.641 |
type in our own regular Expressions | 3,637.24 | 3.16 |
would be a per which would be a perfect | 3,638.96 | 3.44 |
example of that all right well let me | 3,640.4 | 4.36 |
propose that we try to solve one other | 3,642.4 | 5.56 |
problem here whereby if I go into the | 3,644.76 | 5.72 |
same version as before which is now | 3,647.96 | 4.599 |
ignoring case but I type in one of my | 3,650.48 | 3.92 |
other email addresses let me go ahead | 3,652.559 | 4.441 |
and run python of validate and this time | 3,654.4 | 4.76 |
let me type in not maen harvard.edu | 3,657 | 4.24 |
which I use primarily but my another | 3,659.16 | 4.28 |
email address of mine maen cs50.h | 3,661.24 | 4.92 |
harvard.edu which forwards to the same | 3,663.44 | 5.08 |
let me go ahead and hit enter now and | 3,666.16 | 5.48 |
huh invalid even though I'm pretty sure | 3,668.52 | 4.88 |
that is in fact my email address well | 3,671.64 | 4.32 |
let's put our finger on the reason why | 3,673.4 | 5.919 |
why at the moment is mail at cs50.h | 3,675.96 | 6.879 |
harvard.edu being considered invalid | 3,679.319 | 6.04 |
even though I'm pretty sure I send and | 3,682.839 | 6.121 |
receive email email from that address | 3,685.359 | 3.601 |
too why might that be because there is a | 3,689.599 | 9.121 |
DOT that has come after the ad symbol | 3,693.48 | 9 |
exactly there's a DOT after my cs50 and | 3,698.72 | 5.52 |
I'm not expecting any dots there I'm | 3,702.48 | 4.119 |
expecting only again word characters | 3,704.24 | 5.92 |
which is a through z 0-9 and underscore | 3,706.599 | 5.881 |
so I'm going to have to retool here but | 3,710.16 | 4.04 |
how could I go about doing this well it | 3,712.48 | 4.04 |
turns out theoretically there could be | 3,714.2 | 3.839 |
other email addresses even though they'd | 3,716.52 | 3.4 |
be getting a little excessively long for | 3,718.039 | 4.881 |
instance mailin at something. cs50.h | 3,719.92 | 4.84 |
harvard.edu which is not technically | 3,722.92 | 4.119 |
exist but it could you can have of | 3,724.76 | 4.2 |
course multiple dots in a domain name | 3,727.039 | 3.76 |
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