Convert Java Regex to javascript regex

Question

([a-zA-Z0-9_\\-])([a-zA-Z0-9_\\.+~!#/$%^&*_=\\'?\\-]*)@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*(\\.[A-Za-z0-9]{2,})$

which is working fine for Java but it is not working for JavaScript might be backward slash have a some problem, please tell me how I can convert above java regex into Java Script.

Answer 1

Just reduce the double backslashes to singles. Also, you don't need to escape hyphen if it's the last character in a character class. Also also, you don't need to escape wildcard characters in a character class

Something like this

/([a-zA-Z0-9_-])([a-zA-Z0-9_.+~!#/$%^&*_='?-]*)@[A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*(\.[A-Za-z0-9]{2,})$/

Answer 2

It depends on how you are using this? In what code?

you probably just need one \ everywhere you have two \\.

var re = new RegExp("ab+c");

or

var re = /ab+c/;

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions