How to useregular expression in Javascript

A regular expression (regex) is a sequence of characters that define a search pattern.

Syntax:

let regex = new RegExp(pattern, flags);

Example: In this example, we will use the regular expression to compare two strings.

Javascript

let str1 = "this iS w3wiki";
let str2 = "This IS GeeksfOrgeeks";
console.log(str1)
console.log(str2)

function myGeeks() {
    let pattern = new RegExp(str1, 'gi');
    let result = pattern.test(str2);
    console.log(result ? true : false);
}
myGeeks()

Output

this iS w3wiki
This IS GeeksfOrgeeks
true

This approach is similar to Approach 2 but provides an alternative method using the === operator directly with the lowercase versions of the strings. It’s concise and readable.

Compare the Case Insensitive strings in JavaScript

Comparing strings in a case-insensitive manner means comparing them without taking care of the uppercase and lowercase letters.

Here are some common approaches to compare the case-insensitive string in JavaScript:

Table of Content

JavaScript toUpperCase() function
JavaScript toLowerCase() function
Using localCompare()
Using regular expression

Tags:

#JavaScript-DSA #JavaScript-Questions #javascript-string #JavaScript #Web Technologies

Approach 3: Using localCompare()

How to useregular expression in Javascript

Syntax:

Compare the Case Insensitive strings in JavaScript

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