Python Regex-programs

Python - Check if String Contain Only Defined Characters using Regex

Last Updated: 05 January 2024

In this article, we are going to see how to check whether the given string contains only a certain set of characters in Python. These define ...read more

Extract IP address from file using Python

Last Updated: 10 February 2022

Let us see how to extract IP addresses from a file using Python.Algorithm :Import the re module for regular expression.Open the file using t...read more

python-utility

Python - Substituting patterns in text using regex

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Last Updated: 29 December 2020

Regular Expression (regex) is meant for pulling out the required information from any text which is based on patterns. They are also widely ...read more

Python - Check whether a string starts and ends with the same character or not (using Regular Expression)

Last Updated: 31 July 2023

Given a string. The task is to write a regular expression to check whether a string starts and ends with the same character.Examples:Input : ...read more

Name validation using IGNORECASE in Python Regex

Last Updated: 29 December 2020

In this article, we will learn about how to use Python Regex to validate name using IGNORECASE. re.IGNORECASE : This flag allows for case-in ...read more

Python program to validate an IP Address

Last Updated: 22 April 2023

Prerequisite: Python RegexGiven an IP address as input, write a Python program to check whether the given IP Address is Valid or not.What is ...read more

Check if email address valid or not in Python

Last Updated: 30 September 2024

Given a string, write a Python program to check if the string is a valid email address or not.An email is a string (a subset of ASCII charac ...read more

Python | Remove all characters except letters and numbers

Last Updated: 10 January 2025

Objective is to write a program that filters out all characters from a string except for letters (a-z, A-Z) and digits (0-9). The aim is to ...read more

Find all the numbers in a string using regular expression in Python

Last Updated: 08 May 2023

Given a string str containing numbers and alphabets, the task is to find all the numbers in str using regular expression.Examples:Input: abc ...read more

Python regex to find sequences of one upper case letter followed by lower case letters

DSA

Last Updated: 06 September 2024

Write a Python Program to find sequences of one upper case letter followed by lower case letters. If found, print 'Yes', otherwise 'No'. Exa ...read more

Program to check if a string contains any special character

Last Updated: 08 April 2024

Given a string, the task is to check if that string contains any special character (defined special character set). If any special character ...read more

Extracting email addresses using regular expressions in Python

Last Updated: 29 December 2020

Let suppose a situation in which you have to read some specific data like phone numbers, email addresses, dates, a collection of words etc. ...read more

Python | Check for URL in a String

DSA

Last Updated: 05 March 2025

We are given a string that may contain one or more URLs and our task is to extract them efficiently. This is useful for web scraping, text p ...read more

python-string

Python program to check the validity of a Password

Last Updated: 06 September 2024

In this program, we will be taking a password as a combination of alphanumeric characters along with special characters, and checking whethe ...read more