Python Programming

As you can see, regular expressions are strings specifying a search pattern.

Regular expressions are powerful, as they can represent sets of valid strings concisely in a single string pattern.

Regular expressions also allow for very fast searching and matching (compared to manually writing a for-loop with if-else statements for example).

You can easily use it to search for and replace text segments. Some text editors even allow you to search for words using regular expressions, for example on Notepad++ on Windows.