regex starts with string javascript

 

 

 

 

The RegExp constructor. Regular expressions can be created in two different ways in JavaScript, similar to the ones used in strings.With this all working as expected, we are now ready to start learning Regex by itself, without having to worry about the JavaScript code alongside it. I have a JavaScript variable with the regex pattern in it but I cant seem to be able to make it work with the RegEx class.but if I change it into a proper regex expression (by removing the quotes and adding the/at the start and end of the pattern), it starts working JavaScript Syntax. There are two ways to create regex in JS.Searches the input string for a given pattern. If a match is found returns the index of the start of the match otherwise, returns 1. The JavaScript RegExp class represents regular expressions, and both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text.The index at which to start the next match. Javascript regexp object regular expressions , regexp methods string class test regex matches part string call strings match method mystring match regex. Javascript replace commas string stack overflow JavaScript. JS Array JS Boolean JS Date JS Error JS Global JS JSON JS Math JS Number JS Operators JS RegExp JS Statements JS String.Example. Check if a string starts with "Hello": var str "Hello world, welcome to the universe." var n str.startsWith("Hello") Eg: string a "This is a simple