jQuery Exact Contains

gistfile1.js

// Problem: jQuery's :contains expression does not do an exact match.
// Solution: Exact contains `$("div").filter(":econtains(smart)");`


$.extend($.expr[":"], {
  econtains: function(obj, index, meta, stack) {
    return (obj.textContent || obj.innerText || $(obj).text() || "").toLowerCase() == meta[3].toLowerCase();
  }
});

$("div").filter(":contains(smart)").length === 1 // false
$("div").filter(":econtains(smart)").length === 1 // true

<div>smart</div>
<div>smart-ass</div>