I want to make a bid system on a website. That means users can post their bid (natural number). I want to make sure users don't try to post characters, decimal numbers, etc. I don't want to use is_numeric function because hexadecimal notation is allowed. I was thinking to use preg_match for this. But in php.net the documentation for this function is little and I have no idea how to use preg_match.
So how should I check if a variable is a natural number with preg_match?
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