JSFiddle - React, Tailwind, and code Playground

HTML

<input id="field" name="field" />
<button type="button" id="button">OK</button>

JavaScript

$( document ).ready( function() {

    $( '#button' ).click( function( e ) {
    
        e.preventDefault();
        
        if( new RegExp( "[a-zA-z0-9]+" ).test( $( '#field' ).val() ) === false ) {
            alert( 'Somente caracteres alfa-numéricos' );
        }
    });
});