regexa2.py

"""
   Learn Python regular expressions by writing the following 3 functions.

    In each function's docstring we show the expected result.

    The tests verify these expected results when you hit Save + Verify. We will do a more ample regex bite later on.
    Note that for parsing HTML you would use a library of some sort, this is just to train your regex skills.

    Update 14th of Aug 2019: we updated the template slightly (text inputs are passed into the functions) to improve the tests for this Bite. If you get confusing result, use Try again to start with the updated template.
"""
""
import re

COURSE = ('Introduction 1 Lecture 01:47'
          'The Basics 4 Lectures 32:03'
          'Getting Technical!  4 Lectures 41:51'
          'Challenge 2 Lectures 27:48'
          'Afterword 1 Lecture 05:02')
TWEET = ('New PyBites article: Module of the Week - Requests-cache '
         'for Repeated API Calls - http://pybit.es/requests-cache.html '
         '#python #APIs')
HTML = ('<p>pybites != greedy</p>'
        '<p>not the same can be said REgarding ...</p>')


def extract_course_times(course=COURSE):
    """Return the course timings from the passed in
       course string. Timings are in mm:ss (minutes:seconds)
       format, so taking COURSE above you would extract:
       ['01:47', '32:03', '41:51', '27:48', '05:02']
       Return this list.
    """
    c = re.compile(r'[0-9][0-9]:[0-9][0-9]')
    return c.findall(course)
    pass

def get_all_hashtags_and_links(tweet=TWEET):
    """Get all hashtags and links from the tweet text
       that is passed into this function. So for TWEET
       above you need to extract the following list:
       ['http://pybit.es/requests-cache.html',
        '#python',
        '#APIs']
       Return this list.
       """
    u = re.compile(r'https?://\S+|#\S+')
    return u.findall(tweet)
    pass

def match_first_paragraph(html=HTML):
    """Extract the first paragraph of the passed in
       html, so for HTML above this would be:
       'pybites != greedy' (= content of first paragraph).
       Return this string."""
    s = re.compile(r'<p>')
    start = s.search(html).end()
    e = re.compile(r'</p>')
    end = e.search(html).start()
    return html[start:end]
    pass

times = extract_course_times(COURSE)
print(times)
urlsandhashes = get_all_hashtags_and_links(TWEET)
print(urlsandhashes)
paragraphtext = match_first_paragraph(HTML)
print(paragraphtext)