Field of 13 digits without letters or symbols

What is the problem? Please be detailed.

Hi. I need to restrict a code in a field that is 13 digits long, no more or less, and it must not contain letters or symbols. Somebody that could help me?

PD. Sorry for translating my spanish with google :sweat_smile:

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I solve it with this "regex(.,'^[0-9]{13}$')". I'll leave it here if it's useful for someone. Thanks.

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