^start of line
.+any character (except for line terminators), repeated at least once
\sany whitespace character
иthe literal и (108010 / 20708 / 43816) (case sensitive)
\sany whitespace character
.+any character (except for line terminators), repeated at least once
$end of line
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string