Menggunakan re.match, re.search, re.findall

import re
print(re.match(r'\d+', '123abc'))  # match
print(re.match(r'\d+', 'abc123'))  # None

import re
m = re.search(r'\d+', 'abc 123 def')
if m: print(m.group())

import re
print(re.findall(r'\d+', 'one 1 two 22 three 333'))

import re
for m in re.finditer(r'\d+', 'x1 y22 z333'):
    print(m.group(), m.start(), m.end())

import re
m = re.search(r'(\w+)@(\w+)', 'send to user@example')
if m:
    print(m.group(), m.group(1), m.group(2))

import re
print(re.fullmatch(r'\d+', '123'))    # match
print(re.fullmatch(r'\d+', '123abc'))  # None

import re
print(re.split(r'[,;\s]+', 'one,two; three four'))

import re
print(re.sub(r'\d+', 'NUM', 'I have 3 cats and 12 dogs'))

import re
digits = re.compile(r'\d+')
print(digits.findall('abc 123 def 456'))

import re
print(re.findall(r'hello', 'HELLO World', re.IGNORECASE))