How to compose a regular expression checking string completely?

Question

PHP

I need a regular expression that allows a string consisting only of letters of the English and Russian alphabet, from 2 to 25 characters long. My version:
"/^[А-Яа-яA-Za-z]{2, 25}/"
As I understand it: first, the strings are characters A-Yaa-zA-Za-z in an amount from two to 25.
But if you enter a string like that, sdfsd sdfsdfthen preg_match still returns true.
How to make it so that the regular expression checks the string completely, and does not skip lines with spaces, numbers, and special characters?

Answer 1

what about the end of the line?
well, flags $
(modifiers) are still needed :)
, the type string sdfsd sdfsdfwill be true due to satisfaction with the regular expression. from 2 to 25 characters from the beginning of the line.
sdfsdfrom the beginning of the timeline has a length of 5, which fits the range of 2-25