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        First of all, this is a newsgroup with common language as English.
Please observe this and don't post Chinese post here. Since most people here
don't know Chinese, you post will be very likely ignored.

        Secondly, it's recommand to post here in "text" format, not in HTML.

        For "Regular Expression" of 0-15 digits, it is /\d{0-15}/. For RegEx
of t most 18 digits, with 4 decimal places precision, /\d{0-18}./d{4}/

        I'm actually not sure about whether the second one is what you want,
and will leave it to others to verify.

Regards,
Lau Lei Cheong

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