In [2]:

    

import re


    

In [3]:

    

re.findall("abc","xyzabc..abc ABC ")


    

    
Out[3]:





['abc', 'abc']

In [5]:

    

re.findall("1+","11111111 1111")


    

    
Out[5]:





['11111111', '1111']

In [6]:

    

re.findall("ab+","abababa , abb, aba  abababa abbbb ab ")


    

    
Out[6]:





['ab', 'ab', 'ab', 'abb', 'ab', 'ab', 'ab', 'ab', 'abbbb', 'ab']

In [7]:

    

re.findall("a[123]b","a1b a2b, a3bss a123b   axb")


    

    
Out[7]:





['a1b', 'a2b', 'a3b']

In [10]:

    

re.findall("a[^123]b","a1b a2b, a3bss a123b   axb")


    

    
Out[10]:





['axb']

In [11]:

    

re.findall(r'a[\d]b',"a1b a2b, a3bss a123b   axb")


    

    
Out[11]:





['a1b', 'a2b', 'a3b']

In [12]:

    

print(re.findall(r'\d+','123xyz456'))


    

    




['123', '456']

In [16]:

    

print(re.findall(r'\d*xyz','123xyz xyz'))


    

    




['123xyz', 'xyz']

In [17]:

    

print(re.findall(r'\d+\??','12?  12'))


    

    




['12?', '12']

In [20]:

    

print(re.findall(r'\d+xyz','111xyz 123xyz'))


    

    




['111xyz', '123xyz']

In [23]:

    

print(re.findall(r'\d+',"12345"))
print(re.findall(r'\d+?',"12345"))


    

    




['12345']
['1', '2', '3', '4', '5']

In [29]:

    

print(re.findall(r'\d{2,3}?xyz',"123xyz"))
print(re.findall(r'xyz\d{2,3}?',"xyz123"))


    

    




['123xyz']
['xyz12']

In [28]:

    

print(re.findall(r'(\w+?)(\d+)','abc123'))
print(re.findall(r'(\w+?)(\w+)','abc123'))


    

    




[('abc', '123')]
[('a', 'bc123')]

In [33]:

    

print(re.findall(r'<div>(.+?)</div>','<div>title1</div><div>title2</div>')) #非贪婪匹配了


    

    




['title1', 'title2']

In [37]:

    

print(re.findall(r'^\w+','abc123\n12312312123',re.MULTILINE))


    

    




['abc123', '12312312123']

In [40]:

    

print(re.findall(r'((\d*)(a+))', '123a a'))


    

    




[('123a', '123', 'a'), ('a', '', 'a')]

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