How to implement a search pattern?

Question

PHP

Hello. Tell me how to implement a search by the template of the entered data in php.
For example, there is a search form for images in the database, if you enter a picture resolution of 240x320 there, then the search will only search by permissions.
I'll deal with the conditions myself, at least give me a tip how it should look like there may be some kind of regular season. to define it (DIGITXNUMBERS). I'm a beginner myself, so far.

Answer 1

NUMBERS

'/([\d]+)x([\d])+/i'