如何写这样的正则表达式?

有一个字符串

1<a ...="" href="sdfsds">5498</a>

,我想取出5498,该如何做?
---------------------------------------------------------------

1<input id="demo" value='&lt;a href="sdfsds" ...&gt;5498&lt;/a&gt;'/>
1<script>   
2alert(demo.value.replace(/<[^>]*>/g,""))   
3alert(demo.value.match(/(?:>)([^>]*)(?:<)/)[1])   
4</script>
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