Javascript Regex to remove any spaces, special characters and numbers

Question

At the moment I have the following $scope.user.username.replace(/[\\s]/g, '');

This removes and special characters and spaces, I need to add in the ability to prevent numbers and special characters too but I can't quite grasp how Regex works.

Would someone be able to help me out?

Answer 1

只需在字符类中添加要删除的字符：

replace(/[\s.;,?%0-9]/, '')

Answer 2

You should just be able to use not in the matching group and remove everything that isn't a letter:

/[^a-zA-Z]/g

DEMO