USE THIS to Find & Replace in JavaScript | Replace All Occurrences | JavaScript for Beginners

How to check if a string contains a substring in JavaScript? String is sequence of characters. Substring is sequence of characters within sequence of characters. How to find certain characters within a sequence of characters and replace one or all of them? More simply find characters within characters or find characters within words and replace with new one. In JavaScript we can use includes string method to check if a string contains a substring. The includes string method returns true if a string contains a specified substring. Otherwise it returns false. Includes is an ES6 feature.

It matches characters so it can match characters that are parts of a word. Includes method is case sensitive. We can replace characters in a string by using replace string method.
But
Replace replaces only first occurrence of characters. If we want to replace multiple occurrences of characters, we can use regex expression with replace string method in JavaScript.

We can also use additional flags in regex expression to make it case sensitive or case insensitive. This is how We can find if a string contains substring, and replace it's single or multiple occurrences with another substring. In other words, find characters and replace with any other characters easily by using includes and replace in JavaScript with regex.

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