Regular Expresstions in javascript

Regular expressions are an essential feature of JavaScript, and they are used for pattern matching and manipulation of strings. Here are some of the reasons why regular expressions are needed in JavaScript:
1.Searching and replacing text: Regular expressions can be used to search and replace text in strings. They can help you find specific patterns of text and replace them with something else.
2.Data validation: Regular expressions can be used to validate user input. For example, you can use them to check if an email address is valid or if a phone number is in the correct format.
3.Parsing data: Regular expressions can be used to extract specific data from a string. For example, you can use them to extract all the URLs from a block of text.
4.URL manipulation: Regular expressions can be used to manipulate URLs. For example, you can use them to extract the domain name from a URL.

1. String manipulation: Regular expressions can be used to manipulate strings. For example, you can use them to remove unwanted characters from a string. Overall, regular expressions are a powerful tool for working with strings in JavaScript, and they are essential for many programming tasks