^start of line
.*any character (except for line terminators), repeated any number of times
\w+any word character, repeated at least once
.*any character (except for line terminators), repeated any number of times
$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