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php-regexHow to remove all non-numeric characters using PHP regex?

To remove all non-numeric characters using PHP regex, the following code can be used:

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

This code will output a string with only numeric characters, for example:

Input: $string = "Hello123World456";
## Output example

The code consists of the following parts:

  1. preg_replace() - This is a PHP function that performs a regular expression search and replace.
  2. /[^0-9]/ - This is the regular expression pattern that matches any non-numeric character.
  3. '' - This is the replacement string, which is an empty string in this case, meaning that the matched characters will be removed.
  4. $string - This is the string that will be searched and replaced.

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