Python | Difference between re.findall() and re.finditer()

re.finditer() returns iterator of matched objects in the string while re.findall() returns list of matched patterns in string. Refer below snippet for understanding difference between re.finditer() and re.findall() .

Code Snippet 1 : Extracting domain name from text

  • Extracting urls from text using Python re.finditer
  •       
    import re
    
    text = ''' Extract the doamin from the urls www.gcptutorials.com,
    www.wikipedia.org, www.google.com'''
    
    pattern = r'(www.([A-Za-z_0-9-]+)(.\w+))'
    
    
    find_iter_result = re.finditer(pattern, text)
    
    print(type(find_iter_result))
    print(find_iter_result)
    
    for i in find_iter_result:
        print(i.group(2))
        
        
        

    Output

         
    < class 'callable_iterator' >
    < callable_iterator object at 0x7f0c5cc24e48 >
    gcptutorials
    wikipedia
    google    
         
         

  • Extracting urls from text using Python re.findall
  •       
    import re
    
    text = ''' Extract the domain from the urls www.gcptutorials.com,
    www.wikipedia.org, www.google.com'''
    
    pattern = r'(www.([A-Za-z_0-9-]+)(.\w+))'
    
    
    find_all_result = re.findall(pattern, text)
    
    print(type(find_all_result))
    print(find_all_result)
    for i in find_all_result:
        print(i[1])
        
        

    Output

         
    < class 'list' >
    [('www.gcptutorials.com', 'gcptutorials', '.com'), ('www.wikipedia.org', 'wikipedia', '.org'), ('www.google.com', 'google', '.com')]
    gcptutorials
    wikipedia
    google      
         
         

    Code Snippet 2 : Extracting emails from text

    Extracting emails from text using re.finditer
          
    import re
    
    sample_str = 'dummy email foo@test.com, one more dummy email bar@gmail.com testing'
    
    emails = re.finditer(r'[\w\.-]+@[\w\.-]+', sample_str)
    for email in emails: 
        print(email)
        print(email.group(0))
        
        

    Example Output

         
    <re.Match object; span=(12, 24), match='foo@test.com'>
    foo@test.com
    <re.Match object; span=(47, 60), match='bar@gmail.com'>
    bar@gmail.com    
    

    Extracting emails from text using re.findall
         
    import re
    
    sample_str = 'dummy email foo@test.com, one more dummy email bar@gmail.com testing'
    
    emails = re.findall(r'[\w\.-]+@[\w\.-]+', sample_str) 
    for email in emails:
        print (email)
        
         
        

    Example Output

         
    foo@test.com
    bar@gmail.com
        


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