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RegEx does not allow 0 to be entered by phone number

As long as I have prime "numbers" ...

/^[0-9]+$/

How do I do this to avoid leading zero (not starting at zero) or preg_replace, which removes all spaces and results in zero? Thank you.

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/^[1-9][0-9]+$/


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Only numbers that do not start with 0:

/^[1-9][0-9]+$/

Remove all leading spaces and zero:



$num = preg_replace('/^(?:0|\s)*([0-9]+)$/', '\1', ' 0999');

To remove all whitespace in a string, as well as those not maintained, use str_replace. This can be done with a regex, but if you are going to loop a lot of numbers that will be slower.

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/^[^0][0-9]+$/
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(^([1-9]{1})+([0-9]{9})+$

This code for a phone number is 10 characters long and does not start with zero.

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