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return str.replace(/(\w)(\w*)(\s|$)/g, "$2$1ay$3")

The third solution doesn't work for "()()()((".
Expected false got undefined.
Fixed solution:
function validParentheses(parens){
var n = 0;
for (var i = 0; i < parens.length; i++) {
if (parens[i] == '(') n++;
if (parens[i] == ')') n--;
if (n < 0) return false;
}

if (n === 0) {
return true;
}
if (n > 0) {    // Have to return something when n > 0.
    return false;
}

}