In [1]:

    

import re


    

In [2]:

    

s = 'aaa-AAA-123'


    

In [3]:

    

print(re.search('aaa', s))


    

    




<re.Match object; span=(0, 3), match='aaa'>

In [4]:

    

print(re.search('xxx', s))


    

    




None

In [5]:

    

print(re.search('^aaa', s))


    

    




<re.Match object; span=(0, 3), match='aaa'>

In [6]:

    

print(re.search('^123', s))


    

    




None

In [7]:

    

print(re.search('aaa$', s))


    

    




None

In [8]:

    

print(re.search('123$', s))


    

    




<re.Match object; span=(8, 11), match='123'>

In [9]:

    

print(re.search('[A-Z]+', s))


    

    




<re.Match object; span=(4, 7), match='AAA'>

In [10]:

    

s = '012-3456-7890'


    

In [11]:

    

print(re.fullmatch(r'\d{3}-\d{4}-\d{4}', s))


    

    




<re.Match object; span=(0, 13), match='012-3456-7890'>

In [12]:

    

s = 'tel: 012-3456-7890'


    

In [13]:

    

print(re.fullmatch(r'\d{3}-\d{4}-\d{4}', s))


    

    




None

In [14]:

    

s = '012-3456-7890'


    

In [15]:

    

print(re.search(r'^\d{3}-\d{4}-\d{4}$', s))


    

    




<re.Match object; span=(0, 13), match='012-3456-7890'>

In [16]:

    

s = 'tel: 012-3456-7890'


    

In [17]:

    

print(re.search('^\d{3}-\d{4}-\d{4}$', s))


    

    




None

In [18]:

    

s = 'ABC'


    

In [19]:

    

print(re.search('abc', s))


    

    




None

In [20]:

    

print(re.search('abc', s, re.IGNORECASE))


    

    




<re.Match object; span=(0, 3), match='ABC'>