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<script type="text/javascript">
var test = '123456,789,123.12345678';
var reg = /^¥?-?(?!\.)(?!\d{13})(?:\d{1,3}(?:,\d{3}){0,3}|\d{1,12})(?:\.\d{1,8})?$/ig;
document.write(test.match(reg));
</script>
<script type="text/javascript">
var test = '123456,789,123.12345678';
var reg = /^¥?-?(?!\.)(?!\d{13})(?:\d{1,3}(?:,\d{3})*|\d{1,12})(?:\.\d{1,8})?$/ig;
document.write(test.match(reg));
</script>
<script type="text/javascript">
var test = '13,123.1';
var reg = /^¥?-?(?!\.)(?!\d{13})\d{1,3}(,?\d{3})*(\.\d{1,3})?$/ig;
document.write(test.match(reg));
</script>