^start of line
+matches at least one character from the set below:
\wany word character
-the literal - (4510 / 558 / 2D16)
-the literal - (4510 / 558 / 2D16)
\d{4}a digit, repeated exactly 4 times
-the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
-the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
-the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
-the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
-the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
.any character (except for line terminators)
gzthe literal text gz (case insensitive) $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
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters