text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
with the English language here I seem to | 480.12 | 5.479 |
be saying if username and Dot in domain | 482.72 | 5.039 |
as though I'm asking the question if the | 485.599 | 5.481 |
username and the dot are in the domain | 487.759 | 4.761 |
but that's not what this means these are | 491.08 | 3.559 |
two separate Boolean Expressions if | 492.52 | 4 |
username and | 494.639 | 5.441 |
separately if dot in domain and if I | 496.52 | 5.079 |
parenthesize this we could make that | 500.08 | 3.6 |
even more clear by putting parentheses | 501.599 | 3.88 |
there parentheses here so just to be | 503.68 | 3.199 |
clear it's really two Boolean | 505.479 | 2.961 |
Expressions that we're ending together | 506.879 | 4.16 |
not one longer english-like sentence now | 508.44 | 5.36 |
if I go ahead and run this python of | 511.039 | 5.601 |
validate dopy enter I'll do my own email | 513.8 | 5 |
address again mailin harvard.edu and | 516.64 | 5.72 |
that's valid and it looks like I could | 518.8 | 5.239 |
tolerate something like this if I do | 522.36 | 4.919 |
mailin at just say Harvard I think at | 524.039 | 5.36 |
the moment this is going to be invalid | 527.279 | 4.481 |
now maybe the top level domain Harvard | 529.399 | 4.241 |
exists but at the moment it looks like | 531.76 | 3.24 |
we're looking for something more we're | 533.64 | 3.72 |
looking for a top level domain too like | 535 | 4.6 |
edu so for now we'll just consider for | 537.36 | 5.479 |
this to be invalid but it's not just | 539.6 | 6.08 |
that we want to do it's not just that we | 542.839 | 3.961 |
want to check for the presence of a | 545.68 | 2.92 |
username and the presence of a dot let's | 546.8 | 3.279 |
be more specific let's start to now | 548.6 | 2.919 |
narrow the scope of this program not | 550.079 | 3.041 |
just to be about generic emails more | 551.519 | 4.32 |
generally but about edu addresses so | 553.12 | 4.56 |
specifically for someone in a US | 555.839 | 3.281 |
University for instance whose email | 557.68 | 4.399 |
address tends to end with doedu I can be | 559.12 | 4.52 |
a little more precise and you might | 562.079 | 3.841 |
recall this function already instead of | 563.64 | 4.24 |
just saying is there a DOT somewhere in | 565.92 | 5.359 |
domain let me instead say and the domain | 567.88 | 6.92 |
ends with quote unquote. edu so now | 571.279 | 5.361 |
we're being even more precise we want | 574.8 | 3.68 |
there to be minimally a username that's | 576.64 | 3.96 |
not empty it's not just quote unquote | 578.48 | 4.359 |
nothing and we want the domain name to | 580.6 | 5.32 |
actually end with doedu let me go ahead | 582.839 | 5.161 |
and run python of validate dopy and just | 585.92 | 3.4 |
to make sure I haven't made things even | 588 | 3.2 |
worse let me at least chest my own email | 589.32 | 4.32 |
address which does seem to be valid now | 591.2 | 3.879 |
it seems that I minimally need to | 593.64 | 3.12 |
provide a username because we definitely | 595.079 | 3.601 |
do have that check in place so I'm going | 596.76 | 4.079 |
to go ahead and say mailin and now I'm | 598.68 | 4.56 |
going to go ahead and say at and it | 600.839 | 4.721 |
looks like I could be a little malicious | 603.24 | 4.839 |
here just say maen at.edu as though | 605.56 | 4.279 |
minimally meeting the requirements of | 608.079 | 3.961 |
this of this pattern and that of course | 609.839 | 4.401 |
is considered valid but I'm pretty sure | 612.04 | 5.44 |
there's no one at mailin at.edu we need | 614.24 | 5.279 |
to have some domain name in there so | 617.48 | 3.919 |
we're still not being quite as generous | 619.519 | 3.481 |
now we could absolutely continue to | 621.399 | 3.68 |
iterate on this program and we could add | 623 | 3.76 |
some more Boolean Expressions we could | 625.079 | 3.681 |
maybe use some other python methods for | 626.76 | 3.48 |
checking more precisely is there's | 628.76 | 3 |
something to the left of the dot to the | 630.24 | 3.279 |
right of the dot we could use split | 631.76 | 3.4 |
multiple times but honestly this just | 633.519 | 3.481 |
escalates quickly like you end up having | 635.16 | 4.88 |
to write a lot of code just to express | 637 | 4.8 |
something that's relatively simple in | 640.04 | 4.76 |
spirit just format this like an email | 641.8 | 5.68 |
address so how can we go about improving | 644.8 | 4.92 |
this well it turns out in Python there's | 647.48 | 4.919 |
a library for regular Expressions it's | 649.72 | 5.359 |
called succinctly re and in the re | 652.399 | 4.761 |
Library you have a lot of capabilities | 655.079 | 5.721 |
to Define and check for and even replace | 657.16 | 5.88 |
patterns again a regular expression is a | 660.8 | 4.8 |
pattern and this Library the re library | 663.04 | 4.039 |
in Python is going to let us to Define | 665.6 | 2.84 |
some of these patterns like a pattern | 667.079 | 3.041 |
for an email address and then use some | 668.44 | 4.12 |
built-in functions to actually validate | 670.12 | 4.399 |
a user's input against that pattern or | 672.56 | 3.92 |
even use these patterns to change the | 674.519 | 4 |
user's input or extract partial | 676.48 | 3.4 |
information there from we'll see | 678.519 | 4.12 |
examples of all this and more so what | 679.88 | 4.48 |
can and should I do with this Library | 682.639 | 3.041 |
well first and foremost it comes with a | 684.36 | 3.159 |
lot of functionality here's the URL for | 685.68 | 4.12 |
instance to the official documentation | 687.519 | 3.721 |
and let me propose that we focus on | 689.8 | 3.24 |
using one of the most versatile | 691.24 | 4.039 |
functions in the library library namely | 693.04 | 5.599 |
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