7.3. Regexp Search¶
7.3.1. About¶
re.search()Searches if pattern contains a string
7.3.2. Examples¶
Usage of re.search():
import re
def contains(pattern, text)
if re.search(pattern, text):
return True
else:
return False
COMMIT_MESSAGE = 'MYPROJ-1337, MYPROJ-997 removed obsolete comments'
JIRA_ISSUEKEY = r'[A-Z]{2,10}-[0-9]{1,6}'
REDMINE_NUMBER = r'#[0-9]+'
contains(JIRA_ISSUEKEY, COMMIT_MESSAGE) # True
contains(REDMINE_NUMBER, COMMIT_MESSAGE) # False
7.3.3. Assignments¶
"""
* Assignment: Regexp Search Astronauts
* Complexity: easy
* Lines of code: 6 lines
* Time: 5 min
English:
1. Use `re.search()` to check if Astronaut first and last names are in the text [1]
2. Astronauts to find:
a. Neil Armstrong
b. Buzz Aldrin
c. Michael Collins
d. Jan Twardowski
e. Mark Watney
3. Run doctests - all must succeed
Polish:
1. Użyj `re.search()` do sprawdzenia czy imiona i nazwiska Astronautów występują w tekście [1]
2. Astronauci do znalezienia:
a. Neil Armstrong
b. Buzz Aldrin
c. Michael Collins
d. Jan Twardowski
e. Mark Watney
3. Uruchom doctesty - wszystkie muszą się powieść
References:
[1] Kennedy, J.F. Moon Speech - Rice Stadium,
URL: http://er.jsc.nasa.gov/seh/ricetalk.htm
Year: 2019
Retreived: 2019-12-14
Tests:
>>> import sys; sys.tracebacklimit = 0
>>> result['Neil Armstrong']
<re.Match object; span=(78, 92), match='Neil Armstrong'>
>>> result['Buzz Aldrin']
<re.Match object; span=(116, 127), match='Buzz Aldrin'>
>>> result['Michael Collins']
<re.Match object; span=(562, 577), match='Michael Collins'>
>>> result['Jan Twardowski'] is None
True
>>> result['Mark Watney'] is None
True
"""
import re
DATA = ("Apollo 11 was the spaceflight that first landed humans on the Moon. "
"Commander Neil Armstrong and lunar module pilot Buzz Aldrin formed "
"the American crew that landed the Apollo Lunar Module Eagle on "
"July 20, 1969, at 20:17 UTC. Armstrong became the first person to "
"step onto the lunar surface six hours and 39 minutes later on "
"July 21 at 02:56 UTC; Aldrin joined him 19 minutes later. They spent "
"about two and a quarter hours together outside the spacecraft, "
"and they collected 47.5 pounds (21.5 kg) of lunar material to bring "
"back to Earth. Command module pilot Michael Collins flew the command "
"module Columbia alone in lunar orbit while they were on the Moon's "
"surface. Armstrong and Aldrin spent 21 hours, 36 minutes on the "
"lunar surface at a site they named Tranquility Base before lifting "
"off to rejoin Columbia in lunar orbit. ")
result = {
'Neil Armstrong': ...,
'Buzz Aldrin': ...,
'Michael Collins': ...,
'Jan Twardowski': ...,
'Mark Watney': ...,
}
"""
* Assignment: Regexp Search Moon Speech
* Complexity: easy
* Lines of code: 5 lines
* Time: 8 min
English:
1. Use `re.search()` to find in text [1]
2. Define `result: str` containing paragraph starting with 'We choose to go to the moon'
3. Run doctests - all must succeed
Polish:
1. Użyj `re.search()` do znalezienia w tekscie [1]
2. Zdefiniuj `result: str` zawierający tekst paragrafu zaczynający się od słów "We choose to go to the moon"
3. Uruchom doctesty - wszystkie muszą się powieść
References:
[1] Kennedy, J.F. Moon Speech - Rice Stadium,
URL: http://er.jsc.nasa.gov/seh/ricetalk.htm
Year: 2019
Retreived: 2019-12-14
Hints:
* In this assignments all HTML paragraphs starts with `<p>` and ends with `</p>`
* In real life paragraphs parsing is more complex, but here it is simplified.
Tests:
>>> import sys; sys.tracebacklimit = 0
>>> result
'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 which we intend to win,and the others, too.'
"""
import re
DATA = ("<h1>TEXT OF PRESIDENT JOHN KENNEDY'S RICE STADIUM MOON SPEECH</h1>\n"
"<p>President Pitzer, Mr. Vice President, Governor, "
"CongressmanThomas, Senator Wiley, and Congressman Miller, Mr. Webb, "
"Mr.Bell, scientists, distinguished guests, and ladies and "
"gentlemen:</p><p>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 which we intend to win,and the "
"others, too.</p><p>It is for these reasons that I regard the "
"decision last year to shift our efforts in space from low to high "
"gear as among the most important decisions that will be made during "
"my incumbency in the office of the Presidency.</p><p>In the last 24 "
"hours we have seen facilities now being created for the greatest "
"and most complex exploration in man's history.We have felt the "
"ground shake and the air shattered by the testing of a Saturn C-1 "
"booster rocket, many times as powerful as the Atlas which launched "
"John Glenn, generating power equivalent to 10,000 automobiles with "
"their accelerators on the floor.We have seen the site where the F-1 "
"rocket engines, each one as powerful as all eight engines of the "
"Saturn combined, will be clustered together to make the advanced "
"Saturn missile, assembled in a new building to be built at Cape "
"Canaveral as tall as a48 story structure, as wide as a city block, "
"and as long as two lengths of this field.</p>")
result = ...
"""
* Assignment: Regexp Search Time
* Complexity: medium
* Lines of code: 4 lines
* Time: 5 min
English:
1. Use regular expressions to check text [1] contains time in UTC (format: `%H:%M UTC`)
2. Use simplified checking: `##:## UTC`, where `#` is a digit
3. Define `result: str` with matched time
4. Run doctests - all must succeed
Polish:
1. Użyj wyrażeń regularnych do sprawdzenia czy tekst [1] zawiera godzinę w UTC (format: `%H:%M UTC`)
2. Użyj uproszczonego sprawdzania: `##:## UTC`, gdzie `#` to dowolna cyfra
3. Zdefiniuj `result: str` ze znalezionym czasem
4. Uruchom doctesty - wszystkie muszą się powieść
References:
[1] Wikipedia Apollo 11,
URL: https://en.wikipedia.org/wiki/Apollo_11
Year: 2019
Retreived: 2019-12-14
Hints:
* `.group()`
Tests:
>>> import sys; sys.tracebacklimit = 0
>>> result
'20:17 UTC'
"""
import re
DATA = ("Apollo 11 was the spaceflight that first landed humans on the Moon. "
"Commander Neil Armstrong and lunar module pilot Buzz Aldrin formed "
"the American crew that landed the Apollo Lunar Module Eagle on July "
"20, 1969, at 20:17 UTC. Armstrong became the first person to step "
"onto the lunar surface six hours and 39 minutes later on July 21 at "
"02:56 UTC; Aldrin joined him 19 minutes later. They spent about two "
"and a quarter hours together outside the spacecraft, and they "
"collected 47.5 pounds (21.5 kg) of lunar material to bring back to "
"Earth. Command module pilot Michael Collins flew the command module "
"Columbia alone in lunar orbit while they were on the Moon's surface."
"Armstrong and Aldrin spent 21 hours, 36 minutes on the lunar surface"
"at a site they named Tranquility Base before lifting off to rejoin "
"Columbia in lunar orbit.")
result = ...
"""
* Assignment: Regexp Search Datetime
* Complexity: hard
* Lines of code: 4 lines
* Time: 13 min
English:
1. Use regular expressions to check text [1] contains time in UTC (format: `%H:%M UTC`)
2. Note, that this is slightly modified text than previously
3. Check if text contains time in UTC (format: `%H:%M UTC`)
4. Found match must be a valid time
5. Run doctests - all must succeed
Polish:
1. Użyj wyrażeń regularnych do sprawdzenia czy tekst [1] zawiera godzinę w UTC (format: `%H:%M UTC`)
2. Zwróć uwagę, że to lekko zmodyfikowany tekst niż poprzednio
3. Sprawdź czy tekst zawiera godzinę w UTC (format: `%H:%M UTC`)
4. Znalezisko musi być poprawnym czasem
5. Uruchom doctesty - wszystkie muszą się powieść
References:
[1] Wikipedia Apollo 11,
URL: https://en.wikipedia.org/wiki/Apollo_11
Year: 2019
Retreived: 2019-12-14
Hints:
* `.group()`
Tests:
>>> import sys; sys.tracebacklimit = 0
>>> result
'02:56 UTC'
"""
import re
DATA = ("Apollo 11 was the spaceflight that first landed humans on the Moon. "
"Commander Neil Armstrong and lunar module pilot Buzz Aldrin formed "
"the American crew that landed the Apollo Lunar Module Eagle on July "
"20, 1969, at 20:60 UTC. Armstrong became the first person to step "
"onto the lunar surface six hours and 39 minutes later on July 21 at "
"02:56 UTC; Aldrin joined him 19 minutes later. They spent about two "
"and a quarter hours together outside the spacecraft, and they "
"collected 47.5 pounds (21.5 kg) of lunar material to bring back to "
"Earth. Command module pilot Michael Collins flew the command module "
"Columbia alone in lunar orbit while they were on the Moon's surface."
"Armstrong and Aldrin spent 21 hours, 36 minutes on the lunar surface"
"at a site they named Tranquility Base before lifting off to rejoin "
"Columbia in lunar orbit.")
result = ...