import re

m1 = re.match(r'ab*', 'a') #Repeat 0 or more times of the previous character (b)
if m1:
    print(m1.group(0))
else:
    print('Not match')

m2 = re.match(r'ab+', 'a') #One or more repetitions of the previous letter (b)
if m2:
    print(m2.group(0))
else:
    print('Not match')

m3 = re.match(r'ab?', 'abb') #Repeat 0 or 1 of the previous character (b)
if m3:
    print(m3.group(0))
else:
    print('Not match')

m4 = re.match(r'ab$', 'abb') #Does it match the end of the string?
if m4:
    print(m4.group(0))
else:
    print('Not match')

m5 = re.match(r'[a-e]', 'f') # []One of the characters in (a, b, c, d,Does it match e)
if m5:
    print(m5.group(0))
else:
    print('Not match')

import re

#Does it match from the beginning
match = re.match(r'\d+-*\d+$', '012-3456')
print(match.group(0)) # '012-3456'

#Do you match on the way
search = re.search(r'\d{3}', '012-3456')
print(search.group(0)) # '012'

#List all matching patterns
print(re.findall(r'\d{3}', '012-3456')) # ['012', '345']

#Split by the specified pattern delimiter
print(re.split(r'[,、]', '1,2, san')) # ['1', '2', 'Mr.']

#Convert characters of the specified pattern to another pattern
print(re.sub(r'(\d),(\d)', r'\2,\1', '1,2, san')) # 2,1, san

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