1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
\d{3}a digit, repeated exactly 3 times
-the literal - (4510 / 558 / 2D16)
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 - (4510 / 558 / 2D16)
Group 3(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 digit
3the literal 3 (5110 / 638 / 3316)
0the literal 0 (4810 / 608 / 3016)
1the literal 1 (4910 / 618 / 3116)
the literal (3210 / 408 / 2016)
Group 4([01][0-9]|2[0-3]) 0the literal 0 (4810 / 608 / 3016)
1the literal 1 (4910 / 618 / 3116)
0-9one character from 0 (4810) to 9 (5710)
2the literal 2 (5010 / 628 / 3216)
0-3one character from 0 (4810) to 3 (5110)
:the literal : (5810 / 728 / 3A16)
0-5one character from 0 (4810) to 5 (5310)
\da digit