Find and replace a text string with Regular Expressions in JavaScript

Find_and_Replace.js

var regex = /Find this text string/,
    replacement = 'Replace with this string';
function replaceText(i,el) {
    if (el.nodeType === 3) {
        if (regex.test(el.data)) {
            el.data = el.data.replace(regex, replacement);
        }
    } else {
        $(el).contents().each( replaceText );
    }
}

// $('body').each( replaceText );