Cleanup WordPress

cleanup.js

function cleanup () {
    var textContent = jQuery('.wp-editor-area').val();
    textContent = textContent
        .replace(/(\<center\>)(["a-z,.!?':;@£$%=\[\]{}^&*()_”“–—‘’\-\+0-9 \n]*)(\<\/center\>)/ig, "<blockquote>$2</blockquote>")
        .replace(/(\<img.+\/\>)/g, "\n\n")
        .replace(/(\<i\>)(.*)(\<\/i\>)/g, "<em>$2</em>")
        .replace(/(\<b\>)(.*)(\<\/b\>)/g, "<strong>$2</strong>");
    jQuery('.wp-editor-area').val(textContent);    
};