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I want a regular expression that accepts numeric only between 15 to 17 digits.

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^\d{15,17}$ - For any digit (use [0-9] instead of \d to avoid Unicode characters, if applicable).
^[1-9]\d{14,16}$ - If you don't want the number to start with all zeros.

Of course, it might be easier to parse the number and check it, it fits nicely in a long value.

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