паспорт the literal text паспорт (case sensitive) \d{4}a Unicode decimal digit, repeated exactly 4 times
\s*a Unicode whitespace character, repeated any number of times
-?optionally matches the literal - (4510 / 558 / 2D16)
\s*a Unicode whitespace character, repeated any number of times
\d{6}a Unicode decimal digit, repeated exactly 6 times
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