^start of line
/the literal / (4710 / 578 / 2F16)
Group 1(media/catalog/product/cache) media/catalog/product/cachethe literal text media/catalog/product/cache (case sensitive) /the literal / (4710 / 578 / 2F16)
\d+a digit, repeated at least once
/thumbnail/the literal text /thumbnail/ (case sensitive) \d+a digit, repeated at least once
xthe literal x (12010 / 1708 / 7816) (case sensitive)
\d+a digit, repeated at least once
/the literal / (4710 / 578 / 2F16)
+matches at least one character from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
0-9one character from 0 (4810) to 9 (5710)
/the literal / (4710 / 578 / 2F16)
\S+any non-whitespace character, repeated at least once
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