Javascript String Replace: How to Replace String in JavaScript

Javascript String replace() is an inbuilt function that returns the new string with some or all matches of the pattern replaced by the replacement. The pattern can be the string or the RegExp or Regular Expression, and the replacement can be the string or the function to be called for each match. If the pattern is a  string, only the first occurrence will be replaced.

Javascript String replace()

The javascript string replace() method does not change the String object it is called on. It only returns a new string if we want to perform a global search and replace, including the g switch in the regular expression.

Syntax

The syntax of the Javascript string replace() method is the following.

string.replace(searchValue, newValue)

#javascript #javascript string replace #regexp #regular expression

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Javascript String Replace: How to Replace String in JavaScript

Javascript String replace() is an inbuilt function that returns the new string with some or all matches of the pattern replaced by the replacement. The pattern can be the string or the RegExp or Regular Expression, and the replacement can be the string or the function to be called for each match. If the pattern is a  string, only the first occurrence will be replaced.

Javascript String replace()

The javascript string replace() method does not change the String object it is called on. It only returns a new string if we want to perform a global search and replace, including the g switch in the regular expression.

Syntax

The syntax of the Javascript string replace() method is the following.

string.replace(searchValue, newValue)

#javascript #javascript string replace #regexp #regular expression

Replace A Character in A String using JavaScript

You can use the replace() method to replace the occurrence of a character inside a string in JavaScript.

Here is an example that replaces a character in a string with another character using the replace() method:

const str = 'Hello World!'

const updated = str.replace('l', '!')

console.log(updated)
// He!lo World!

By default, the replace() will only replace the first occurrence of the specified character.

To replace all occurrences of a specified character, you must use a regular expression with the global modifier (g):

const str = 'Hello World!'

const updated = str.replace(/l/g, '!')

console.log(updated)
// He!!o Wor!d!

For a global case-insensitive replacement, you can combine the global modifier (g) with the ignore case modifier (i):

const str = 'HeLLo World!'

const updated = str.replace(/l/gi, '!')

console.log(updated)
// He!!o Wor!d!

Alternatively, you could use the replaceAll() method to replace all occurrences of a character inside a string:

const str = 'HelLo World!'

const updated = str.replaceAll(/l/gi, '!')

console.log(updated)
// He!!o Wor!d!

The replaceAll() method was introduced in ES2021. It replaces all occurrences of the search string with the replacement text and returns a new string.

Original article source at: https://attacomsian.com/

#javascript #string #replace #character 

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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