0*the literal 0 (4810 / 608 / 3016) , repeated any number of times
\d+a digit, repeated at least once
Negative Lookahead(?!.* - ) .*any character (except for line terminators), repeated any number of times
.*any character (except for line terminators), repeated any number of times
\.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:jpe?g|png|tiff?) jpthe literal text jp (case sensitive) e?optionally matches the literal e (10110 / 1458 / 6516) (case sensitive)
gthe literal g (10310 / 1478 / 6716) (case sensitive)
pngthe literal text png (case sensitive) tifthe literal text tif (case sensitive) f?optionally matches the literal f (10210 / 1468 / 6616) (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