php

How to identify Russian letters in a string? The short answer is: [А-Яа-яЁё] but depending on your regex flavor, [\p{Cyrillic}] might work. What in the word does this regex mean? It’s just like [A-Za-z] with a twist. The Ёё at the end adds support for ё (“yo”) which is in the Latin group of characters. See this question on Stack Overflow.