^start of line
Non-Capturing Group(?:0[1-9]|1[0-2]) 0the literal 0 (4810 / 608 / 3016)
1-9one character from 1 (4910) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
0-2one character from 0 (4810) to 2 (5010)
/the literal / (4710 / 578 / 2F16)
Non-Capturing Group(?:0[1-9]|[12]\d|3[01]) 0the literal 0 (4810 / 608 / 3016)
1-9one character from 1 (4910) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
\da Unicode decimal digit
3the literal 3 (5110 / 638 / 3316)
0the literal 0 (4810 / 608 / 3016)
1the literal 1 (4910 / 618 / 3116)
/the literal / (4710 / 578 / 2F16)
\d{4}a Unicode decimal digit, repeated exactly 4 times
+matches at least one character from the set below:
-the literal - (4510 / 558 / 2D16)
the literal (3210 / 408 / 2016)
.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:0[1-9]|1[0-2]) 0the literal 0 (4810 / 608 / 3016)
1-9one character from 1 (4910) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
0-2one character from 0 (4810) to 2 (5010)
/the literal / (4710 / 578 / 2F16)
Non-Capturing Group(?:0[1-9]|[12]\d|3[01]) 0the literal 0 (4810 / 608 / 3016)
1-9one character from 1 (4910) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
\da Unicode decimal digit
3the literal 3 (5110 / 638 / 3316)
0the literal 0 (4810 / 608 / 3016)
1the literal 1 (4910 / 618 / 3116)
/the literal / (4710 / 578 / 2F16)
\d{4}a Unicode decimal digit, repeated exactly 4 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