regular-expression

Technical Scripter

Technical Scripter 2022

Conversion of Regular Expression to Finite Automata

Last Updated: 18 January 2022

As the regular expressions can be constructed from Finite Automata using the State Elimination Method, the reverse method, state decompositi...read more

Computer Subject

Theory of Computation

Extract substrings between any pair of delimiters

Last Updated: 24 March 2023

Given a string str, the task is to extract the substrings present between two delimiters, i.e. '[' and ']'.Examples:Input: str = “[This is ...read more

Technical Scripter 2020

State Elimination Method convert DFA/NFA/Ɛ-NFA into Regular Expression

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Last Updated: 11 November 2020

State Elimination Method :Rules to convert a DFA/NFA//Ɛ-NFA into corresponding Regular Expression.Arden's Method is not capable of converti...read more

GATE CS

Theory of Computation

DFA

Check if given email address is valid or not in C++

Last Updated: 26 October 2020

Given a string email that denotes an Email Address, the task is to check if the given string is a valid email id or not. If found to be true ...read more

Remove uppercase, lowercase, special, numeric, and non-numeric characters from a String

Last Updated: 03 January 2023

Given string str of length N, the task is to remove uppercase, lowercase, special, numeric, and non-numeric characters from this string and ...read more

Check if a number is binary or not in Java

Last Updated: 11 September 2023

Given a number N, the task is to check first whether the given number is binary or not and its value should be greater than 1. print true if ...read more

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binary-representation

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Check three or more consecutive identical characters or numbers

Last Updated: 19 December 2022

Given string str, the task is to check whether the given string contains 3 or more consecutive identical characters/numbers or not by using ...read more

How to validate Indian driving license number using Regular Expression

Last Updated: 23 December 2022

Given string str, the task is to check whether the given string is a valid Indian driving license number or not by using Regular Expression. ...read more

Convert user input string into regular expression using JavaScript

Last Updated: 28 April 2023

In this article, we will convert the user input string into a regular expression using JavaScript.To convert user input into a regular expre...read more

How to validate Visa Card number using Regular Expression

Last Updated: 20 December 2022

Given a string str, the task is to check whether the given string is a valid Visa Card number or not by using Regular Expression.The valid V ...read more

How to validate CVV number using Regular Expression

Last Updated: 21 December 2022

Given string str, the task is to check whether it is a valid CVV (Card Verification Value) number or not by using Regular Expression.The val ...read more

Program to remove HTML tags from a given String

Last Updated: 21 December 2022

Given a string str that contains some HTML tags, the task is to remove all the tags present in the given string str.Examples:Input: str = "d ...read more

How to validate IFSC Code using Regular Expression

Last Updated: 14 March 2023

Given string str, the task is to check whether the given string is a valid IFSC (Indian Financial System) Code or not by using Regular Expre ...read more

How to validate GST (Goods and Services Tax) number using Regular Expression

Last Updated: 22 December 2022

Given string str, the task is to check whether the given string is a valid GST (Goods and Services Tax) number or not using Regular Expressi ...read more