DATE POSTED: the literal text DATE POSTED: (case sensitive) .*?any Unicode character (except for line terminators), repeated any number of times
\d{4}a Unicode decimal digit, repeated exactly 4 times
.*?any Unicode character (except for line terminators), repeated any number of times
,the literal , (4410 / 548 / 2C16)
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