React Tutorial

React Tutorial

1629625335

How to use RegEx (Regular Expressions) in JavaScript

Regular expressions play a vital role in every high-level programming language and so in JavaScript. Let's know them all in detail... 

A Regular Expression (RegEx) is a sequence of characters that defines a search pattern. It helps you to "match" part of the text (string) by given rule.

#javascript #regex

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How to use RegEx (Regular Expressions) in JavaScript

Mad Libs: Using regular expressions

From Tiny Python Projects by Ken Youens-Clark

Everyone loves Mad Libs! And everyone loves Python. This article shows you how to have fun with both and learn some programming skills along the way.


Take 40% off Tiny Python Projects by entering fccclark into the discount code box at checkout at manning.com.


When I was a wee lad, we used to play at Mad Libs for hours and hours. This was before computers, mind you, before televisions or radio or even paper! No, scratch that, we had paper. Anyway, the point is we only had Mad Libs to play, and we loved it! And now you must play!

We’ll write a program called mad.py  which reads a file given as a positional argument and finds all the placeholders noted in angle brackets like <verb>  or <adjective> . For each placeholder, we’ll prompt the user for the part of speech being requested like “Give me a verb” and “Give me an adjective.” (Notice that you’ll need to use the correct article.) Each value from the user replaces the placeholder in the text, and if the user says “drive” for “verb,” then <verb>  in the text replaces with drive . When all the placeholders have been replaced with inputs from the user, print out the new text.

#python #regular-expressions #python-programming #python3 #mad libs: using regular expressions #using regular expressions

Madyson  Reilly

Madyson Reilly

1601055000

Regular Expressions: What and Why?

Regular expressions is a powerful search and replace technique that you probably have used even without knowing. Be it your text editor’s “Find and Replace” feature, validation of your http request body using a third party npm module or your terminal’s ability to return list of files based on some pattern, all of them use Regular Expressions in one way or the other. It is not a concept that programmers must definitely learn but by knowing it you are able to reduce the complexity of your code in some cases.

_In this tutorial we will be learning the key concepts as well as some use cases of Regular Expressions in _javascript.

How do you write a Regular Expression?

There are two ways of writing Regular expressions in Javascript. One is by creating a **literal **and the other is using **RegExp **constructor.

//Literal
const myRegex=/cat/ig

//RegExp
const myRegex=new RegExp('cat','ig')

While both types of expressions will return the same output when tested on a particular string, the benefit of using the RegExp constructor is that it is evaluated at runtime hence allowing use of javascript variables for dynamic regular expressions. Moreover as seen in this benchmark test the RegExp constructor performs better than the literal regular expression in pattern matching.

The syntax in either type of expression consists of two parts:

  • pattern : The pattern that has to be matched in a string.
  • flags : these are modifiers which are rules that describe how pattern matching will be performed.

#regular-expressions #javascript #programming #js #regex #express

CSS Boss

CSS Boss

1606912089

How to create a calculator using javascript - Pure JS tutorials |Web Tutorials

In this video I will tell you How to create a calculator using javascript very easily.

#how to build a simple calculator in javascript #how to create simple calculator using javascript #javascript calculator tutorial #javascript birthday calculator #calculator using javascript and html

React Tutorial

React Tutorial

1629625335

How to use RegEx (Regular Expressions) in JavaScript

Regular expressions play a vital role in every high-level programming language and so in JavaScript. Let's know them all in detail... 

A Regular Expression (RegEx) is a sequence of characters that defines a search pattern. It helps you to "match" part of the text (string) by given rule.

#javascript #regex

Gunjan  Khaitan

Gunjan Khaitan

1593602220

JavaScript Regular Expression | JavaScript Regex | JavaScript Tutorial For Beginners

This video on JavaScript Regular Expressions will introduce you to the basic working of these expressions. A Regular Expression is a sequence of characters that forms a search pattern. This sequence can be used for text search and text replacement. To help understand the concepts better, we explain what patterns, flags and quantifiers along with a demo of examples.

#javascript #regex #developer