6.8. Regex Syntax Group

  • Catch expression results

  • Can be named or positional

  • (...) - unnamed group

  • (?P<mygroup>...) - named group mygroup

  • (?:...) - non-capturing group

  • (?#...) - comment

6.8.1. SetUp

>>> import re

6.8.2. Positional Group

  • (...) - unnamed (positional) group

  • Used when you want to extract specific information from a text

>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> re.findall(r'\dnd', TEXT)
['2nd']
>>>
>>> re.findall(r'(\d{1,2})nd', TEXT)
['2']
>>>
>>> re.findall(r'\d{1,2}(nd)', TEXT)
['nd']
>>> re.findall(r'(\d{1,2})(nd)', TEXT)
[('2', 'nd')]

>>> re.findall(r'\d{1,2}:\d{2}', TEXT)
['12:00']
>>>
>>> re.findall(r'(\d{1,2}):\d{2}', TEXT)
['12']
>>>
>>> re.findall(r'\d{1,2}:(\d{2})', TEXT)
['00']
>>>
>>> re.findall(r'(\d{1,2}):(\d{2})', TEXT)
[('12', '00')]

>>> re.findall(r'([A-Z][a-z]+\s[A-Z][a-z]+)', TEXT)
['Mark Watney']
>>>
>>> re.findall(r'([A-Z][a-z]+) ([A-Z][a-z]+)', TEXT)
[('Mark', 'Watney')]
>>>
>>> re.findall(r'([A-Z][a-z]+) ([A-Z][a-z]+)', TEXT)[0]
('Mark', 'Watney')

>>> firstname = r'([A-Z][a-z]+)'
>>> lastname = r'([A-Z][a-z]+)'
>>>
>>> re.findall(f'{firstname} {lastname}', TEXT)[0]
('Mark', 'Watney')

>>> firstname = r'([A-Z][a-z]+)'
>>> lastname = r'([A-Z][a-z]+)'
>>> name = f'{firstname} {lastname}'
>>>
>>> re.findall(name, TEXT)[0]
('Mark', 'Watney')

>>> firstname = r'[A-Z][a-z]+'
>>> lastname = r'[A-Z][a-z]+'
>>> name = f'({firstname}) ({lastname})'
>>>
>>> re.findall(name, TEXT)[0]
('Mark', 'Watney')

6.8.3. Named Group

  • (?P<mygroup>...) - named group

  • Used when you want to extract specific information from a text

>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> firstname = r'[A-Z][a-z]+'
>>> lastname = r'[A-Z][a-z]+'
>>> name = f'(?P<firstname>{firstname}) (?P<lastname>{lastname})'
>>>
>>> re.findall(name, TEXT)
[('Mark', 'Watney')]
>>>
>>> re.search(name, TEXT)
<re.Match object; span=(11, 22), match='Mark Watney'>
>>>
>>> re.search(name, TEXT).groups()
('Mark', 'Watney')
>>>
>>> re.search(name, TEXT).groupdict()
{'firstname': 'Mark', 'lastname': 'Watney'}

>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'
>>> time = r'(?P<hour>\d{1,2}):(?P<minute>\d{1,2})'
>>>
>>> re.findall(time, TEXT)
[('12', '00')]
>>>
>>> re.search(time, TEXT).groups()
('12', '00')
>>>
>>> re.search(time, TEXT).group(0)
'12:00'
>>>
>>> re.search(time, TEXT).group(1)
'12'
>>>
>>> re.search(time, TEXT).group(2)
'00'
>>>
>>> re.search(time, TEXT).groupdict()
{'hour': '12', 'minute': '00'}

6.8.4. Non-Capturing Group

  • (?:...) - non-capturing group

  • Discard the group from the results

  • Used when you want to use parentheses to group a part of the regular expression

>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> re.findall(r'\w{3} \d{1,2}nd, \d{4}', TEXT)
['Jan 2nd, 2000']
>>>
>>> re.findall(r'\w{3} \d{1,2}st|nd|rd|th, \d{4}', TEXT)
['nd']
>>>
>>> re.findall(r'\w{3} \d{1,2}(st|nd|rd|th), \d{4}', TEXT)
['nd']
>>>
>>> re.findall(r'\w{3} \d{1,2}(?:st|nd|rd|th), \d{4}', TEXT)
['Jan 2nd, 2000']
>>>
>>> re.findall(r'(\w{3}) (\d{1,2})(?:st|nd|rd|th), (\d{4})', TEXT)
[('Jan', '2', '2000')]
>>>
>>> re.findall(r'(\w{3}) (\d{1,2})(st|nd|rd|th), (\d{4})', TEXT)
[('Jan', '2', 'nd', '2000')]

>>> date = r'(\w{3} \d{1,2}(?:st|nd|rd|th), \d{4})'
>>> re.findall(date, TEXT)
['Jan 2nd, 2000']

>>> year = r'\d{4}'
>>> month = r'\w{3}'
>>> day = r'\d{1,2}'
>>>
>>> re.findall(f'{month} {day}(st|nd|rd|th), {year}', TEXT)
['nd']
>>>
>>> re.findall(f'{month} {day}(?:st|nd|rd|th), {year}', TEXT)
['Jan 2nd, 2000']

6.8.5. Comment

  • (?#...) - comment

  • Comments are ignored by the regex engine

>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> re.findall(r'\d{4}(?#year)', TEXT)
['2000']
>>>
>>> re.findall(r'\d{1,2}(?#hour):\d{2}(?#minute)', TEXT)
['12:00']

>>> hour = r'\d{1,2}(?#hour)'
>>> minute = r'\d{2}(?#minute)'
>>> time = f'{hour}:{minute}'
>>>
>>> re.findall(time, TEXT)
['12:00']
>>>
>>> time
'\\d{1,2}(?#hour):\\d{2}(?#minute)'

6.8.6. Examples

  • (\w+) - word character (including unicode chars, numbers an underscores)

  • \d+(\.\d+)? - float with optional decimals

  • \d+(,\d+)? - number with coma (,) as thousands separator

  • (?P<word>\w+) - name group word with \w+ with at least one word character (including unicode chars, numbers an underscores)

  • (.+) \1 - matches the the or 55 55

  • (.+) \1 - not matches thethe (note the space after the group)

>>> import re
>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> re.findall(r'\d{,2}(st|nd|rd|th)?', TEXT)  
['', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',
 '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',
 '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',
 '', '', '', '', '', '', '', '', '', '', '', '', '', 'nd', '', '', '',
 '', '', '', '', '', '', '', '', '', '', '', '']
>>>
>>> re.findall(r'\d{1,2}(st|nd|rd|th)?', TEXT)
['nd', '', '', '', '']
>>>
>>> re.findall(r'\d{1,2}(st|nd|rd|th)+?', TEXT)
['nd']
>>>
>>> re.findall(r'\d{1,2}st|nd|rd|th+?', TEXT)
['nd']
>>>
>>> re.findall(r'\d{1,2}(?:st|nd|rd|th)+?', TEXT)
['2nd']
>>>
>>> re.findall(r'(\d{1,2})(st|nd|rd|th)+?', TEXT)
[('2', 'nd')]
>>>
>>> re.findall(r'(\d{1,2})(?:st|nd|rd|th)+?', TEXT)
['2']
>>>
>>> re.findall(r'(\w{3}) (\d{1,2})(?:st|nd|rd|th)+?, (\d{4})', TEXT)
[('Jan', '2', '2000')]
>>>
>>> re.findall(r'(\w{3}) (\d{1,2})(?:st|nd|rd|th)+?, (\d{4})', TEXT)[0]
('Jan', '2', '2000')
>>>
>>> re.findall(r'(\w{3} \d{1,2}(?:st|nd|rd|th)+?, \d{4})', TEXT)
['Jan 2nd, 2000']

6.8.7. Atomic Grouping

6.8.8. Case Study 1

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

result = re.search(r'[A-Z][a-z]+ \d{1,2}nd, \d{4}', TEXT)

print(result.groups())
# ()

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

result = re.search(r'([A-Z][a-z]+) (\d{1,2})nd, (\d{4})', TEXT)

print(result.groups())
# ('Jan', '2', '2000')

result.group()
# 'Jan 2nd, 2000'
result.group(0)
# 'Jan 2nd, 2000'
result.group(1)
# 'Jan'
result.group(2)
# '2'
result.group(3)
# '2000'

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

result = re.search(r'(?P<month>[A-Z][a-z]+) (?P<day>\d{1,2})nd, (?P<year>\d{4})', TEXT)

print(result.groups())
# ('Jan', '2', '2000')

result.group()
# 'Jan 2nd, 2000'
result.group(0)
# 'Jan 2nd, 2000'
result.group(1)
# 'Jan'
result.group(2)
# '2'
result.group(3)
# '2000'

result.group('year')
# '2000'
result.group('month')
# 'Jan'
result.group('day')
# '2'

result.groupdict()
# {'month': 'Jan', 'day': '2', 'year': '2000'}

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

date = r'(?P<month>[A-Z][a-z]+) (?P<day>\d{1,2})nd, (?P<year>\d{4})'
result = re.search(date, TEXT)

result.groups()
# ('Jan', '2', '2000')

result.group()
# 'Jan 2nd, 2000'
result.group(0)
# 'Jan 2nd, 2000'
result.group(1)
# 'Jan'
result.group(2)
# '2'
result.group(3)
# '2000'

result.group('year')
# '2000'
result.group('month')
# 'Jan'
result.group('day')
# '2'

result.groupdict()
# {'month': 'Jan', 'day': '2', 'year': '2000'}

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

year = r'(?P<year>\d{4})'
day = r'(?P<day>\d{1,2})'
month = r'(?P<month>[A-Z][a-z]+)'
date = f'{month} {day}nd, {year}'

result = re.search(date, TEXT)

result.groups()
# ('Jan', '2', '2000')

result.group()
# 'Jan 2nd, 2000'
result.group(0)
# 'Jan 2nd, 2000'
result.group(1)
# 'Jan'
result.group(2)
# '2'
result.group(3)
# '2000'

result.group('year')
# '2000'
result.group('month')
# 'Jan'
result.group('day')
# '2'

result.groupdict()
# {'month': 'Jan', 'day': '2', 'year': '2000'}

6.8.9. Case Study 2

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

year = r'(?P<year>\d{4})'
day = r'(?P<day>\d{1,2})'
month = r'(?P<month>[A-Z][a-z]+)'
date = f'{month} {day}nd, {year}'

result = re.search(date, TEXT)

result.group()
# 'Jan 2nd, 2000'

result.groups()
# ('Jan', '2', '2000')


# st - first
# nd - second
# rd - third
# th - forth

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

year = r'(?P<year>\d{4})'
day = r'(?P<day>\d{1,2})'
month = r'(?P<month>[A-Z][a-z]+)'
date = f'{month} {day}st|nd|rd|th, {year}'

result = re.search(date, TEXT)

result.group()
# 'nd'

result.groups()
# (None, None, None)

# st - first
# nd - second
# rd - third
# th - forth

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

year = r'(?P<year>\d{4})'
day = r'(?P<day>\d{1,2})'
month = r'(?P<month>[A-Z][a-z]+)'
date = f'{month} {day}(st|nd|rd|th), {year}'

result = re.search(date, TEXT)

result.group()
# 'Jan 2nd, 2000'

result.groups()
# ('Jan', '2', 'nd', '2000')

# st - first
# nd - second
# rd - third
# th - forth

import re

TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

year = r'(?P<year>\d{4})'
day = r'(?P<day>\d{1,2})'
month = r'(?P<month>[A-Z][a-z]+)'
date = f'{month} {day}(?:st|nd|rd|th), {year}'

result = re.search(date, TEXT)

result.group()
# 'Jan 2nd, 2000'

result.groups()
# ('Jan', '2', '2000')

# st - first
# nd - second
# rd - third
# th - forth

6.8.10. Use Case - 1

  • Dates

>>> import re
>>> TEXT = 'Email from Mark Watney <mwatney@nasa.gov> received on: Sun, Jan 2nd, 2000 at 12:00 AM'

>>> year = r'(?P<year>\d{4})'
>>> month = r'(?P<month>\w{3})'
>>> day = r'(?P<day>\d{1,2}(?:st|nd|rd|th)+?)'
>>> date = f'{month} {day}, {year}'
>>>
>>> re.search(date, TEXT).groupdict()
{'month': 'Jan', 'day': '2nd', 'year': '2000'}

6.8.11. Use Case - 2

>>> import re

>>> line = 'value=123'
>>>
>>> re.findall(r'(\w+)\s?=\s?(\d+)', line)
[('value', '123')]

>>> line = 'value = 123'
>>>
>>> re.findall(r'(\w+)\s?=\s?(\d+)', line)
[('value', '123')]

6.8.12. Use Case - 3

>>> import re
>>>
>>>
>>> variable = r'(?P<variable>\w+)'
>>> space = r'\s?'  # optional space
>>> value = r'(?P<value>.+)'
>>> assignment = f'^{variable}{space}={space}{value}$'
>>>
>>> line_of_code = 'myvar = 123'
>>> re.findall(assignment, line_of_code)
[('myvar', '123')]

6.8.13. Use Case - 4

>>> import re
>>>
>>>
>>> variable = r'(?P<variable>\w+)'
>>> space = r'\s?(?#optional space)'
>>> value = r'(?P<value>.+)'
>>> assignment = f'^{variable}{space}={space}{value}$'
>>>
>>> assignment
'^(?P<variable>\\w+)\\s?(?#optional space)=\\s?(?#optional space)(?P<value>.+)$'

6.8.14. Assignments

# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`

# %% About
# - Name: RE Syntax PositionalGroup
# - Difficulty: medium
# - Lines: 1
# - Minutes: 3

# %% English
# 1. Define `result: str` with regular expression to find:
#    - year
#    - month
#    - day
# 2. Use positional groups
# 3. For simplicity, all ordinals (st, th, nd, rd) were removed
# 4. Run doctests - all must succeed

# %% Polish
# 1. Zdefiniuj `result: str` z wyrażeniem regularnym aby wyszukać:
#    - rok
#    - miesiąc
#    - dzień
# 2. Użyj grup pozycyjnych
# 3. Dla uproszczenia, usunięto liczebniki porządkowe (st, th, nd, rd)
# 4. Uruchom doctesty - wszystkie muszą się powieść

# %% References
# [1] Authors: Wikipedia contributors
#     Title: Apollo 11
#     Publisher: Wikipedia
#     Year: 2019
#     Retrieved: 2019-12-14
#     URL: https://en.wikipedia.org/wiki/Apollo_11

# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> assert sys.version_info >= (3, 9), \
'Python 3.9+ required'

>>> from pprint import pprint

>>> matches = re.finditer(result, DATA)
>>> assert matches is not None, \
'Invalid pattern, check if you used positional groups'

>>> match = next(matches)
>>> match.group(1)
'July'
>>> match.group(2)
'20'
>>> match.group(3)
'1969'

>>> match = next(matches)
>>> match.group(1)
'July'
>>> match.group(2)
'21'
>>> match.group(3)
'1969'
"""

import re

DATA = """Apollo 11 was the American spaceflight that first landed
humans on the Moon. Commander (CDR) Neil Armstrong and lunar module
pilot (LMP) Buzz Aldrin landed the Apollo Lunar Module (LM) Eagle on
July 20, 1969 at 20:17 UTC, and Armstrong became the first person
to step (EVA) onto the Moon's surface (EVA) 6 hours 39 minutes later,
on July 21, 1969 at 02:56:15 UTC. Aldrin joined him 19 minutes later.
They spent 2 hours 31 minutes exploring the site they had named
Tranquility Base upon landing. Armstrong and Aldrin collected 47.5 pounds
(21.5 kg) of lunar material to bring back to Earth as pilot Michael Collins
(CMP) flew the Command Module (CM) Columbia in lunar orbit, and were on the
Moon's surface for 21 hours 36 minutes before lifting off to rejoin
Columbia."""

# Find all: year, month, day
# Use positional groups
# Note: For simplicity, all ordinals (st, th, nd, rd) were removed
# Example: 'July 21, 1969', 'July 21, 1969'
# Note: define only regex pattern (str), not re.findall(...)
# type: str
result = r''



# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`

# %% About
# - Name: RE Syntax PositionalGroup
# - Difficulty: medium
# - Lines: 1
# - Minutes: 3

# %% English
# 1. Define `result: str` with regular expression to find:
#    - year
#    - month
#    - day
# 2. Use named groups (year, month, day)
# 3. For simplicity, all ordinals (st, th, nd, rd) were removed
# 4. Run doctests - all must succeed

# %% Polish
# 1. Zdefiniuj `result: str` z wyrażeniem regularnym aby wyszukać:
#    - rok
#    - miesiąc
#    - dzień
# 2. Użyj grup nazwanych (year, month, day)
# 3. Dla uproszczenia, usunięto liczebniki porządkowe (st, th, nd, rd)
# 4. Uruchom doctesty - wszystkie muszą się powieść

# %% References
# [1] Authors: Wikipedia contributors
#     Title: Apollo 11
#     Publisher: Wikipedia
#     Year: 2019
#     Retrieved: 2019-12-14
#     URL: https://en.wikipedia.org/wiki/Apollo_11

# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> assert sys.version_info >= (3, 9), \
'Python 3.9+ required'

>>> from pprint import pprint

>>> matches = re.finditer(result, DATA)
>>> assert matches is not None, \
'Invalid pattern, check if you used positional groups'

>>> match = next(matches)
>>> match.group('month')
'July'
>>> match.group('day')
'20'
>>> match.group('year')
'1969'

>>> match = next(matches)
>>> match.group('month')
'July'
>>> match.group('day')
'21'
>>> match.group('year')
'1969'
"""

import re

DATA = """Apollo 11 was the American spaceflight that first landed
humans on the Moon. Commander (CDR) Neil Armstrong and lunar module
pilot (LMP) Buzz Aldrin landed the Apollo Lunar Module (LM) Eagle on
July 20, 1969 at 20:17 UTC, and Armstrong became the first person
to step (EVA) onto the Moon's surface (EVA) 6 hours 39 minutes later,
on July 21, 1969 at 02:56:15 UTC. Aldrin joined him 19 minutes later.
They spent 2 hours 31 minutes exploring the site they had named
Tranquility Base upon landing. Armstrong and Aldrin collected 47.5 pounds
(21.5 kg) of lunar material to bring back to Earth as pilot Michael Collins
(CMP) flew the Command Module (CM) Columbia in lunar orbit, and were on the
Moon's surface for 21 hours 36 minutes before lifting off to rejoin
Columbia."""

# Find all: year, month, day
# Use named groups (year, month, day)
# Note: For simplicity, all ordinals (st, th, nd, rd) were removed
# Example: 'July 21, 1969', 'July 21, 1969'
# Note: define only regex pattern (str), not re.findall(...)
# type: str
result = r''



# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`

# %% About
# - Name: RE Syntax NonCapturingGroup
# - Difficulty: medium
# - Lines: 1
# - Minutes: 3

# %% English
# 1. Define `result: str` with regular expression to find:
#    - all dates (month name followed by day number)
# 2. Use non-capturing group to catch ordinal (st, nd, rd, th)
# 3. Run doctests - all must succeed

# %% Polish
# 1. Zdefiniuj `result: str` z wyrażeniem regularnym aby wyszukać:
#    - wszyskie daty (miesiąc po którym jest dzień)
# 2. Użyj grupy niezłapanej aby złapać liczebnik porządkowy (st, nd, rd, th)
# 3. Uruchom doctesty - wszystkie muszą się powieść

# %% References
# [1] Authors: Wikipedia contributors
#     Title: Apollo 11
#     Publisher: Wikipedia
#     Year: 2019
#     Retrieved: 2019-12-14
#     URL: https://en.wikipedia.org/wiki/Apollo_11

# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> assert sys.version_info >= (3, 9), \
'Python 3.9+ required'

>>> from pprint import pprint

>>> result = re.findall(result, DATA)
>>> pprint(result, compact=True)
['July 20', 'July 21']
"""

import re

DATA = """Apollo 11 was the American spaceflight that first landed
humans on the Moon. Commander (CDR) Neil Armstrong and lunar module
pilot (LMP) Buzz Aldrin landed the Apollo Lunar Module (LM) Eagle on
July 20th, 1969 at 20:17 UTC, and Armstrong became the first person
to step (EVA) onto the Moon's surface (EVA) 6 hours 39 minutes later,
on July 21st, 1969 at 02:56:15 UTC. Aldrin joined him 19 minutes later.
They spent 2 hours 31 minutes exploring the site they had named
Tranquility Base upon landing. Armstrong and Aldrin collected 47.5 pounds
(21.5 kg) of lunar material to bring back to Earth as pilot Michael Collins
(CMP) flew the Command Module (CM) Columbia in lunar orbit, and were on the
Moon's surface for 21 hours 36 minutes before lifting off to rejoin
Columbia."""

# Find all dates (month name followed by day number)
# Use non-capturing group to catch ordinal (st, nd, rd, th)
# Example: 'July 20', 'July 21'
# Note: define only regex pattern (str), not re.findall(...)
# type: str
result = r''



# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`

# %% About
# - Name: RE Syntax Group
# - Difficulty: medium
# - Lines: 2
# - Minutes: 3

# %% English
# 1. Find all duration values
# 2. SKIP durations without hours (only with minutes)
# 3. Use:
#    - `result_a`: using positional group
#    - `result_b`: using named group
# 4. Run doctests - all must succeed

# %% Polish
# 1. Znajdź wszystkie okresy czasowe
# 2. POMIŃ okresy bez godzin (tylko z minutami)
# 3. Define:
#    - `result_a`: używając grupy pozycyjnej
#    - `result_b`: używając grupy nazwanej
# 3. Uruchom doctesty - wszystkie muszą się powieść

# %% References
# [1] Authors: Wikipedia contributors
#     Title: Apollo 11
#     Publisher: Wikipedia
#     Year: 2019
#     Retrieved: 2019-12-14
#     URL: https://en.wikipedia.org/wiki/Apollo_11

# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> assert sys.version_info >= (3, 9), \
'Python 3.9+ required'

>>> from pprint import pprint

>>> result_a = re.findall(result_a, DATA)
>>> pprint(result_a, compact=True, width=20)
[('6', '39'),
 ('2', '31'),
 ('21', '36')]

>>> result_b = re.finditer(result_b, DATA)
>>> result_b = [x.groupdict() for x in result_b]
>>> pprint(result_b, compact=True, width=50)
[{'hours': '6', 'minutes': '39'},
 {'hours': '2', 'minutes': '31'},
 {'hours': '21', 'minutes': '36'}]
"""

import re

DATA = """Apollo 11 was the American spaceflight that first landed
humans on the Moon. Commander (CDR) Neil Armstrong and lunar module
pilot (LMP) Buzz Aldrin landed the Apollo Lunar Module (LM) Eagle on
July 20th, 1969 at 20:17 UTC, and Armstrong became the first person
to step (EVA) onto the Moon's surface (EVA) 6 hours 39 minutes later,
on July 21st, 1969 at 02:56:15 UTC. Aldrin joined him 19 minutes later.
They spent 2 hours 31 minutes exploring the site they had named
Tranquility Base upon landing. Armstrong and Aldrin collected 47.5 pounds
(21.5 kg) of lunar material to bring back to Earth as pilot Michael Collins
(CMP) flew the Command Module (CM) Columbia in lunar orbit, and were on the
Moon's surface for 21 hours 36 minutes before lifting off to rejoin
Columbia."""

# Find all duration values, use positional groups
# SKIP durations without hours (only with minutes)
# Example: [('6', '39'), ('2', '31'), ('21', '36')]
# Note: define only regex pattern (str), not re.findall(...)
# type: str
result_a = r''

# Find all duration values, use named groups
# SKIP durations without hours (only with minutes)
# Example: [{'hours': '6', 'minutes': '39'}, {'hours': '2', 'minutes': '31'}]
# Note: define only regex pattern (str), not re.findall(...)
# type: str
result_b = r''