Regular Expressions in Python Regex Programming Language

In Python 3.11.1, regular expressions (regex in Python Programming Language) are typically used to check and remove text from a string.

The re-module in Python provides functions to function with regular expressions.

Some of the multiple generally used functions in the regex module in Python 3.11.1 are:

  1. Search (): This function searches for a match to a given regex (regular expression) within a sentences, or words (string). Regex Search Module returns a match object if there is a match, or None if there is no match.
  2. findall() function returns a list of all non-overlapping matches within a string.
  3. sub(): This function replaces all given regular expressions within a string.
  4. split(): This function splits a string by the occurrences.

Here’s an example of utilizing the search() module function to find the first occurrence of a regex in a string:

Python Code:

import re

text = “The Boys.”

x = re.search(“Boys”, text)

print(x) # <re.Match object; span=(4, 7), match=’Boys’>

Here’s an example of using the findall() function to find all occurrences of a regular expression in a string:

Code:

import re

text = "The Boys and The Girls."

x = re.findall("[a-z]+", text)

print(x)  # ['The', 'Boys', 'The', 'Girls', 'and']

Regular expressions are compelling and have a lot of functionality, it’s very helpful for string manipulation and pattern matching. But it has a bit of a understanding curve, it’s advised to take some tutorials, and read the documentation and some examples before using it.

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