I have this regular expression:

/^(((?!\-))(xn\-\-)?[a-z0-9\-_]{0,61}[a-z0-9]{1,1}\.)*(xn\-\-)?([a-z0-9\-]{1,61}|[a-z0-9\-]{1,30})\.[a-z]{2,}$/

and this domain value: domain!@#$test:ing.com

I want to remove all this unsupported characters, and I tried this:

string.replace(/^(((?!\-))(xn\-\-)?[a-z0-9\-_]{0,61}[a-z0-9]{1,1}\.)*(xn\-\-)?([a-z0-9\-]{1,61}|[a-z0-9\-]{1,30})\.[a-z]{2,}$/,'');

But this doesn't work, any ideas why?

I tried different codes, and I expect that this code will remove unsupported characters from string.

CodePudding user response：

The regular expression in your question is meant to validate domain names. You can cannot use it to replace characters inside a string. You'll have to create a new regular expression with the undesired characters.

Based on your regex, it will probably be something like:

string.replace(/[^a-z0-9\-_\.]/g, "")

^ negates what's inside the brackets...