<the literal < (6010 / 748 / 3C16)
\s*any whitespace character, repeated any number of times
.*?any character (except for line terminators), repeated any number of times
\s*any whitespace character, repeated any number of times
>the literal > (6210 / 768 / 3E16)
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