Edit in JSFiddle

var btn = document.getElementById("btn");
var result = document.getElementById("result");
btn.onclick = function(){
    function captureOne(re, str) {
      var match = re.exec(str);
      return match && match[1];
    }
    var numRe  = /num=(\d+)/ig,
        wordRe = /word=(\w+)/i,
        a1 = captureOne(numRe,  "num=1"),
        a2 = captureOne(wordRe, "word=1"),
        a3 = captureOne(numRe,  "NUM=2"),
        a4 = captureOne(wordRe,  "WORD=2");
    result.innerHTML = [a1 === a2, a3 === a4];
}

<p>点击查看结果：</p>
<button id="btn">查看结果</button>
<p>结果：</p>
<div id="result"></div>

p {
    font-size: 14px;
    height 24px;
    line-height: 24px;
}