Build regular expression
(http://regexr.com/)
"Tools" panel (at the bottom) explains the expression

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match http or https pattern
   http(s)?://[a-zA-Z0-9\.]+
   http(s)?://[a-zA-Z0-9].+
what are differences?

match phone number
   [1-9][0-9][0-9]-[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]
   [1-9][0-9]{2}-[0-9]{3}-[0-9]{4}

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2:00PM-3:15PM
02:00PM-3:15PM
11:00AM-11:50AM

let's say we don't allow a leading zero

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http://www.cs.virginia.edu/~up3f/cs1111/practice-of-the-day/zipLookup.java

get zip code with quotations

get state and city


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class schedule page source view-source:http://cs1110.cs.virginia.edu/schedule.html

let's take some examples

https://regexr.com/3nve9

https://www.archives.gov/about/organization/telephone-list.html

href="http://www.cs.virginia.edu/~up3f/cs1111/examples/"
href="http://www.spronck.net/pythonbook/pythonbook.pdf#chapter.13"
href="http://www.spronck.net/pythonbook/pythonbook.pdf#section.27.3"
href="http://www.spronck.net/pythonbook/pythonbook.pdf#section.17.2"
href="http://cs1110.cs.virginia.edu/know.html"
href="lab11-gamebox.html"
href="files/002/regex_example1.py"
href="/screencasts/2018-04-13-003.webm"
href="testing.html"
href="files/fake-queue.csv"
href="style.css"
href="bootstrap.united.min.css"
href="#cal001"

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http://rabi.phys.virginia.edu/mySIS/CS2/page.php?Type=Group&Group=CompSci

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http://www.cs.virginia.edu/~up3f/cs1111/practice-of-the-day/alice.txt
find possible names of characters in Alice in Wonderland