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Python re.match() method

The Python re.match() method is used to determine if the regular expression matches at the beginning of a string. It returns a match object if the pattern is found or 'None' otherwise.

Unlike the method re.search(), the re.match() only checks for a match at the beginning of the string. It is useful for validating input or extracting specific patterns at the start of a string.

This method takes a regular expression pattern and a string as arguments. If the pattern matches the beginning of the string it returns a match object containing information about the match such as the matched text and any captured groups.

Following is the syntax and parameters of Python re.match() method −

re.match(pattern, string, flags=0)

Following are the parameter of the python re.match() method −

• pattern: The regular expression pattern to search for.
• string: The input string to search within.
• flags(optional): These flags modify the behavior of the match. These flags can be combined using bit-wise OR (|).

This method returns the match object if the pattern is found in the string otherwise it returns None.

Following is the basic example of using the re.match() method. In this example the pattern 'hello' is matched against the beginning of the string 'hello, world!' −

import re

result = re.match(r'hello', 'hello, world!')
if result:
    print("Pattern found:", result.group())  
else:
    print("Pattern not found")

Pattern found: hello

Here in this example the pattern '\d+-\d+-\d+' is matched against the beginning of the string and groups are used to extract the date components −

import re

result = re.match(r'(\d+)-(\d+)-(\d+)', '2022-01-01: New Year')
if result:
    print("Pattern found:", result.group())  

Pattern found: 2022-01-01

Here in this example named groups are used to extract the first and last names from the beginning of the string −

import re

result = re.match(r'(?P<first>\w+) (?P<last>\w+)', 'John Doe')
if result:
    print("First Name:", result.group('first'))  
    print("Last Name:", result.group('last'))    

First Name: John
Last Name: Doe

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