JS Verify that the mailbox format is the correct instance code

How to use JS to verify that the mailbox format is correct? Share an example.
Code:

/*

* Verify that the mailbox format is correct
* Parameter Stremail, the mailbox that needs to be verified
*/
function Chkemail (stremail) {
if (!/^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$/.test (Stremail)) {
return false;
}
else {
return true;
}
}

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