PHP Regular validation php regular non-PHP regular validation php regular expression hand

/^\d{n}$/  :验证n位的数字/^\d{n,}$/ :验证至少n位数字/^\d{m,n}$/  :验证m-n位的数字/^(0|[1-9][0-9]*)$/  :验证零和非零开头的数字/^[0-9]+(.[0-9]{2})?$/ :验证有两位小数的数字/^[0-9]+(.[0-9]{1,3})?$/ :验证有1-3位小数的数字/^\+?[1-9][0-9]*$/  :验证大于零的正整数：/^\d.?\d*$/          :验证大于零的数：

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