PHP regular expression - filter number only

Question

I know this might sound as really dummy question, but I\'m trying to ensure that the provided string is of a number / decimal format to use it later on with PHP\'s number_fo

Answer 1

To remove anything that is not a number:

$output = preg_replace('/[^0-9]/', '', $input);

Explanation:

• [0-9] matches any number between 0 and 9 inclusively.
• ^ negates a [] pattern.
• So, [^0-9] matches anything that is not a number, and since we're using preg_replace, they will be replaced by nothing '' (second argument of preg_replace).