^start of line
.*?any character (except for line terminators), repeated any number of times
_ExampleXML_the literal text _ExampleXML_ (case sensitive) .*?any character (except for line terminators), repeated any number of times
_2021the literal text _2021 \d+a digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
xmlthe literal text xml (case sensitive) $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