gistfile1.js

$.extend($.expr[':'], {
  matches: function(e, i, m) {
    if (!m[3]) return false;
    var regexp = new RegExp(m[3], 'ig');
    return regexp.test($(e).text());
  }
})

// Usage:
// Say you have

// <p>Look ma</p>
// <p>No hands</p>

// You'd go $('p:matches(no)') and that would give you the second paragraph.
// Regex is case insensitive.