^start of line
\s*any whitespace character, repeated any number of times
?repeats the group contents below at most once:
*matches any number of characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
\'the literal ' (3910 / 478 / 2716)
\'?optionally matches the literal ' (3910 / 478 / 2716)
\s*any whitespace character, repeated any number of times
Group 2([0-9]+(?![0-9]))? ?repeats the group contents below at most once:
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
Negative Lookahead(?![0-9]) 0-9one character from 0 (4810) to 9 (5710)
\s*any whitespace character, repeated any number of times
?repeats the group contents below at most once:
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
\/the literal / (4710 / 578 / 2F16)
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
\"?optionally matches the literal " (3410 / 428 / 2216)
\s*any whitespace character, repeated any number of times
$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