10.14. Regex RE Findall, Finditer¶
re.findall()re.finditer()
10.14.1. Example¶
Usage of re.findall() and re.finditer():
>>> import re
>>>
>>>
>>> HTML = """
... <h1>Header</h1>
... <p>First Paragraph</p>
... <p>Second Paragraph</p>
... <p>Third Paragraph</p>
... """
>>>
>>> re.findall(r'<h1>(.*)</h1>', HTML)
['Header']
>>>
>>> re.findall(r'<p>(.*)</p>', HTML)
['First Paragraph', 'Second Paragraph', 'Third Paragraph']
10.14.2. Use Case - 0x01¶
Find all JIRA issue keys in commit message
>>> import re
>>>
>>>
>>> TEXT = 'MYPROJ-1337, MYPROJ-997 removed obsolete comments'
>>> issuekey = r'[A-Z]{2,10}-[0-9]{1,6}'
>>>
>>> re.findall(issuekey, TEXT)
['MYPROJ-1337', 'MYPROJ-997']
10.14.3. Use Case - 0x02¶
Find All Adverbs
>>> import re
>>>
>>>
>>> TEXT = 'He was carefully disguised but captured quickly by police.'
>>> adverbs = r'\w+ly'
>>>
>>> re.findall(adverbs, TEXT)
['carefully', 'quickly']
10.14.4. Assignments¶
"""
* Assignment: RE Find Dates
* Complexity: easy
* Lines of code: 2 lines
* Time: 5 min
English:
1. Using regular expressions find dates in:
US long format, i.e. "April 12, 1961"
2. Run doctests - all must succeed
Polish:
1. Używając wyrażeń regularnych wyszukaj dat w:
formacie amerykańskim długim np. "April 12, 1961"
2. Uruchom doctesty - wszystkie muszą się powieść
References:
[1] Wikipedia Apollo 11,
URL: https://en.wikipedia.org/wiki/Apollo_11
Year: 2019
Retrieved: 2019-12-14
Tests:
>>> import sys; sys.tracebacklimit = 0
>>> result # doctest: +NORMALIZE_WHITESPACE
['October 4, 1957',
'April 12, 1961',
'May 5, 1961',
'May 25, 1961',
'September 12, 1962',
'September 12, 1962']
"""
import re
TEXT = ("In the late 1950s and early 1960s, the United States was engaged in "
"the Cold War, a geopolitical rivalry with the Soviet Union. On "
"October 4, 1957, the Soviet Union launched Sputnik 1, the first "
"artificial satellite. This surprise success fired fears and "
"imaginations around the world. It demonstrated that the Soviet Union "
"had the capability to deliver nuclear weapons over intercontinental "
"distances, and challenged American claims of military, economic and "
"technological superiority. This precipitated the Sputnik crisis, "
"and triggered the Space Race. President Dwight D. Eisenhower "
"responded to the Sputnik challenge by creating the National "
"Aeronautics and Space Administration (NASA), and initiating Project "
"Mercury, which aimed to launch a man into Earth orbit. But on April "
"12, 1961, Soviet cosmonaut Yuri Gagarin became the first person in "
"space, and the first to orbit the Earth. Nearly a month later, "
"on May 5, 1961, Alan Shepard became the first American in space, "
"completing a 15-minute suborbital journey. After being recovered "
"from the Atlantic Ocean, he received a congratulatory telephone call "
"from Eisenhower's successor, John F. Kennedy. Since the Soviet Union "
"had higher lift capacity launch vehicles, Kennedy chose, from among "
"options presented by NASA, a challenge beyond the capacity of the "
"existing generation of rocketry, so that the US and Soviet Union "
"would be starting from a position of equality. A crewed mission to "
"the Moon would serve this purpose. On May 25, 1961, Kennedy "
"addressed the United States Congress on \"Urgent National Needs\" "
"and declared: I believe that this nation should commit itself to "
"achieving the goal, before this decade [1960s] is out, of landing a "
"man on the Moon and returning him safely to the Earth. No single "
"space project in this period will be more impressive to mankind, "
"or more important for the long-range exploration of space; and none "
"will be so difficult or expensive to accomplish. We propose to "
"accelerate the development of the appropriate lunar space craft. We "
"propose to develop alternate liquid and solid fuel boosters, "
"much larger than any now being developed, until certain which is "
"superior. We propose additional funds for other engine development "
"and for unmanned explorations—explorations which are particularly "
"important for one purpose which this nation will never overlook: the "
"survival of the man who first makes this daring flight. But in a "
"very real sense, it will not be one man going to the Moon—if we make "
"this judgment affirmatively, it will be an entire nation. For all of "
"us must work to put him there. — Kennedy's speech to Congress On "
"September 12, 1962, Kennedy delivered another speech before a crowd "
"of about 40,000 people in the Rice University football stadium in "
"Houston, Texas. A widely quoted refrain from the middle portion of "
"the speech reads as follows: Kennedy, in a blue suit and tie, "
"speaks at a wooden podium bearing the seal of the President of the "
"United States. Vice President Lyndon Johnson and other dignitaries "
"stand behind him. President John F. Kennedy speaking at Rice "
"University on September 12, 1962 There is no strife, no prejudice, "
"no national conflict in outer space as yet. Its hazards are hostile "
"to us all. Its conquest deserves the best of all mankind, and its "
"opportunity for peaceful cooperation may never come again. But why, "
"some say, the Moon? Why choose this as our goal? And they may well "
"ask, why climb the highest mountain? Why, 35 years ago, fly the "
"Atlantic? Why does Rice play Texas? We choose to go to the Moon! We "
"choose to go to the Moon ... We choose to go to the Moon in this "
"decade and do the other things, not because they are easy, "
"but because they are hard; because that goal will serve to organize "
"and measure the best of our energies and skills, because that "
"challenge is one that we are willing to accept, one we are unwilling "
"to postpone, and one we intend to win, and the others, too.")
# Use re.findall() to get dates in US format, i.e. "April 12, 1961"
# type: list[str]
result = ...