text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
names even though they tend to use just | 7,297.88 | 4.4 |
this one suppose they have uh something | 7,299.92 | 4.52 |
like.org as well you could use more | 7,302.28 | 3.52 |
parentheses here and do something like | 7,304.44 | 4.4 |
this Comm or org I'd probably want to go | 7,305.8 | 5.12 |
in and add a question mark colon to make | 7,308.84 | 3.96 |
it non-capture because I don't care | 7,310.92 | 4.92 |
which it is I just want to tolerate both | 7,312.8 | 5.52 |
alternatively we could capture that we | 7,315.84 | 4.319 |
could do something like this where we do | 7,318.32 | 5.24 |
do plus so as to actually capture that | 7,320.159 | 5.52 |
and then we could do something like this | 7,323.56 | 7.72 |
if matches. group one now equals equals | 7,325.679 | 8.081 |
Comm then we could support this so you | 7,331.28 | 4.839 |
could imagine factoring out the logic | 7,333.76 | 4.479 |
just by extracting the top level domain | 7,336.119 | 4.441 |
or TLD and then just using python code | 7,338.239 | 4 |
maybe a list maybe a dictionary to | 7,340.56 | 4.44 |
validate elsewhere outside of the redx | 7,342.239 | 5.081 |
if it's in fact what you expect for now | 7,345 | 4.28 |
though we kept things simple we focused | 7,347.32 | 4.879 |
only on the Doom in this case let's make | 7,349.28 | 4.6 |
one final change to this program so that | 7,352.199 | 3.241 |
we're being a little more specific with | 7,353.88 | 3.799 |
the definition of a Twitter username it | 7,355.44 | 3.719 |
turns out that we're being a little too | 7,357.679 | 3.281 |
generous over here whereby we're | 7,359.159 | 4.161 |
accepting one or more of any character I | 7,360.96 | 4.32 |
check the documentation for Twitter and | 7,363.32 | 3.839 |
Twitter only supports letters of the | 7,365.28 | 5.72 |
alphabet A through Z numbers 0-9 or | 7,367.159 | 6.44 |
underscores so not just dot which is | 7,371 | 4.92 |
literally anything so let me go ahead | 7,373.599 | 4.12 |
and be more precise here at the end of | 7,375.92 | 5 |
my string let me go ahead and say this | 7,377.719 | 5.801 |
set of symbols in square brackets I'm | 7,380.92 | 4.92 |
going to go ahead and say a through z uh | 7,383.52 | 4.88 |
0 through 9 and an underscore because | 7,385.84 | 4.279 |
again those are the only valid symbols I | 7,388.4 | 3.36 |
don't need to bother with an uppercase a | 7,390.119 | 4.361 |
or a lowercase z because we're using re. | 7,391.76 | 5.08 |
ignore case over here but I want to make | 7,394.48 | 4.84 |
sure now that I tolerate not only one or | 7,396.84 | 5.12 |
more of these symbols here but also | 7,399.32 | 4.319 |
maybe some other stuff at the end of the | 7,401.96 | 3.56 |
URL I'm now going to be okay with there | 7,403.639 | 4.281 |
being a slash or a question mark or a | 7,405.52 | 4.44 |
hash at the end of the URL all of which | 7,407.92 | 4.52 |
are valid symbols in a URL but I know | 7,409.96 | 4.92 |
from the Twitter's documentation are not | 7,412.44 | 4.719 |
part of the username all right now I'm | 7,414.88 | 3.719 |
going to go ahead and run python of | 7,417.159 | 5.241 |
twitter. one final time typing in | 7,418.599 | 5.56 |
HTTPS | 7,422.4 | 4.679 |
twitter.com davidj ma maybe with maybe | 7,424.159 | 4.881 |
without a trailing slash but hopefully | 7,427.079 | 3.961 |
with my biggest fingers crossed here I'm | 7,429.04 | 4.519 |
going to go ahead now and hit enter and | 7,431.04 | 5.039 |
thankfully my username is indeed David J | 7,433.559 | 4.801 |
Ma so what more is there in the world of | 7,436.079 | 4.241 |
regular expressions and this own Library | 7,438.36 | 4.359 |
not just re. search and also re.sub | 7,440.32 | 4.64 |
there's other functions too there's re | 7,442.719 | 4.761 |
dosit via which you can split a string | 7,444.96 | 4.48 |
not using a specific character or | 7,447.48 | 4.36 |
characters like a comma and a space but | 7,449.44 | 5 |
multiple characters as well and there's | 7,451.84 | 4.799 |
even functions like re. findall which | 7,454.44 | 4.679 |
can allow you to search for multiple | 7,456.639 | 4.321 |
copies of the same pattern in different | 7,459.119 | 3.761 |
places in a Str so that you can perhaps | 7,460.96 | 4.48 |
and manipulate more than just one so at | 7,462.88 | 4 |
the end of the day now you've really | 7,465.44 | 3.799 |
learned a whole other language like that | 7,466.88 | 4.08 |
of regular expressions and we've used | 7,469.239 | 3 |
them in Python but these regular | 7,470.96 | 3.719 |
Expressions actually exist in so many | 7,472.239 | 5 |
languages too among them JavaScript and | 7,474.679 | 5.44 |
Java and Ruby and more so with this new | 7,477.239 | 4.681 |
language even though it's admittedly | 7,480.119 | 3.321 |
cryptic when you use it for the first | 7,481.92 | 3.239 |
time you have this new found ability to | 7,483.44 | 3.639 |
express these patterns that again you | 7,485.159 | 4.4 |
can use to validate data to clean up | 7,487.079 | 5.441 |
data or even extract data and from any | 7,489.559 | 5.241 |
data set you might have in mind that's | 7,492.52 | 4.48 |
it for this week we will see you next | 7,494.8 | 5.2 |
time | 7,497 | 3 |
[MUSIC PLAYING] | 0.499 | 3.704 |
SPEAKER 1: All right. | 15.844 | 0.956 |
So this is CS50. | 16.8 | 1.8 |
And this is the start of week 3. | 18.6 | 1.81 |
And you'll recall that last time,
we introduced a number of new ideas | 20.41 | 3.23 |
that we'll now start taking for granted
as being already under our belt. | 23.64 | 3.48 |
In particular, we looked last
time at debugging more generally. | 27.12 | 3.47 |
And recall that debugging is the
process of removing bugs from your code, | 30.59 | 3.11 |
removing mistakes from your code. | 33.7 | 1.69 |
And we proposed these
three CS50-specific tools. | 35.39 | 3.34 |
In particular, help50, which
is a command line tool. | 38.73 | 2.589 |
Something that you can
run at your keyboard | 41.319 | 1.791 |
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