How to write correct preg_replace pattern?

Question

PHP

Let's say there is a string "Weather today - 26C"
Help me write the correct preg_match pattern to filter only text in the string , leaving only Latin letters and only, without letters and numbers.

Answer 1

preg_replace('/[^A-Za-z]/', '', $s) -> WeathertodayC

Answer 2

preg_replace('#[^a-zа-я\s\./!?\\:]#iu', '', $s)
not easier
preg_match_all("#[0-9]+#", $string,$out);