问个正则 关于替换值

Question

<textarea id="ta"><span id='0'>3202</span>
<span id='1'>3203</span>
<span id='2'>3204</span>
<span id='3'>3207</span>
<span id='4'>3208</span>
<span id='5'>3209</span>
<span id='6'>3210</span>
<span id='7'>3211</span>
<span id='8'>3214</span>
<span id='9'>3215</span></textarea>
<script>
    var mc = document.getElementById('ta').value.match(/>(\d+)/gi);
    if (mc) {
        mc = mc.join('，').replace(/>/g, '');
        alert(mc)
    }
</script>