^start of line
.*any character (except for line terminators), repeated any number of times
<brthe literal text <br (case sensitive) .*any character (except for line terminators), repeated any number of times
\/?optionally matches the literal / (4710 / 578 / 2F16)
>the literal > (6210 / 768 / 3E16)
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
g modifier: global. Finds all matches instead of stopping after the first