^start of line
.*any character (except for line terminators), repeated any number of times
Character Class[[:space:]] [:space:]a whitespace character, including a line break [ \t\r\n\v\f]
\[the literal [ (9110 / 1338 / 5B16)
TYPEthe literal text TYPE (case sensitive) \]the literal ] (9310 / 1358 / 5D16)
=Ethe literal text =E (case sensitive) Character Class[[:space:]] [:space:]a whitespace character, including a line break [ \t\r\n\v\f]
\[the literal [ (9110 / 1338 / 5B16)
MSGthe literal text MSG (case sensitive) \]the literal ] (9310 / 1358 / 5D16)
Character Class[[:space:]] [:space:]a whitespace character, including a line break [ \t\r\n\v\f]
.*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