var preg = /^[\u2E80-\u9FFF]{2}(\-|\+){1}\d{4}\.txt/
var str = "中国-2015.txt"
alert(preg.test(str)
</script>
<script language="JavaScript"><!--
var s = "abc.def.txt.doc"
var regex = /^(.)+\.doc$/
var matchFlag = regex.test(s)
alert(matchFlag)
//-->
</script>
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