php - Check if a string contains numbers and letters

Question

I want to detect if a string contains both numbers and letters.

For example:

• Given PncC1KECj4pPVW, it would be written to a text file because it contains both.
• Given qdEQ, it would not, because it only contains letters.

Is there a method to do this?

I was trying to use

$string = PREG_REPLACE("/[^0-9a-zA-Z]/i", '', $buffer);

But it didn't work.

Any help would be appreciated.

Answer 1

It seems the simplest way is just to do it in two regex's.

if (preg_match('/[A-Za-z]/', $myString) && preg_match('/[0-9]/', $myString))
{
    echo 'Contains at least one letter and one number';
}

I suppose another way to do it is this below. It says "a letter and then later on at some point a number (or vice versa)". But the one above is easier to read IMO.

if (preg_match('/[A-Za-z].*[0-9]|[0-9].*[A-Za-z]/', $myString))
{
    echo 'Contains at least one letter and one number';
}