Miért nem működik ez a regexp match javascriptben?

A megoldás:

vagy

const email_pattern = /^[0-9a-z\.-]+@([0-9a-z-]+\.)+[a-z]{2,4}$/i;

} else if (!(input_email_dom_1.value).match(email_pattern) ) {

vagy

} else if (!/^[0-9a-z\.-]+@([0-9a-z-]+\.)+[a-z]{2,4}$/.test(input_email_dom_1.value) ) {

vagy

<form action="/action_page.php">

<label for="email">Email:</label>

<input type="email" id="email" name="email"

pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$">

<input type="submit">

</form>

ez esetben ez mind jó:

//const email_pattern = /^[0-9a-z\.-]+@([0-9a-z-]+\.)+[a-z]{2,4}$/i;

//const email_pattern = input_email_dom_1.getAttribute("pattern");

//const email_pattern = new RegExp(input_email_dom_1.getAttribute("pattern"));

//const email_pattern = new RegExp(input_email_dom_1.getAttribute("pattern"), 'g');

és akkor:

} else if (!(input_email_dom_1.value).match(email_pattern) ) {