^start of line
Hithe literal text Hi (case sensitive) .*any character (except for line terminators), repeated any number of times
Page the literal text Page (case sensitive) \d+a digit, repeated at least once
.*any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
.*any character (except for line terminators), repeated any number of 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