Regular Expression in Python - Introduction - Python in Tamil

A regular expression is simply a sequence of characters that define a pattern.

When you want to match a string to perhaps validate an email or password, or even extract some data, a regex is an indispensable tool.

Everything in regex is a character. Even (an empty space character ( ).

While Unicode characters can be used to match any international text, most patterns use normal ASCII (letters, digits, punctuation, and keyboard symbols like $@%#!.)

Why should I learn regex?
Regular expressions are everywhere. Here are some of the reasons why you should learn them:

They do a lot with less –– You can write a few characters to do something that could have taken dozens of lines of code to implement
They are super fast –– Regex patterns wrote with performance in mind takes a very short time to execute. Backtracking might take some time, but even that has optimal variations that run super fast
They are portable –– The majority of regex syntax works the same way in a variety of programming languages
You should learn them for the same reason I do –– they make your work a lot easier
Are there any real-world applications?

Common applications of regex are:

Input validation (emails, usernames, passwords)
Web scraping
Data wrangling
Simple parsing
Also, regex is used for text matching in spreadsheets, text editors, IDEs, and Google Analytics.