0?optionally matches the 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(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) Janthe literal text Jan (case sensitive) Febthe literal text Feb (case sensitive) Marthe literal text Mar (case sensitive) Aprthe literal text Apr (case sensitive) Maythe literal text May (case sensitive) Junthe literal text Jun (case sensitive) Julthe literal text Jul (case sensitive) Augthe literal text Aug (case sensitive) Septhe literal text Sep (case sensitive) Octthe literal text Oct (case sensitive) Novthe literal text Nov (case sensitive) Decthe literal text Dec (case sensitive) \/the literal / (4710 / 578 / 2F16)
1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
{3}matches exactly 3 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
\sa Unicode whitespace character
Group 3((0|1)[0-9]|2[0-3]) 1st Alternative(0|1)[0-9] :the literal : (5810 / 728 / 3A16)
:the literal : (5810 / 728 / 3A16)
x modifier: extended. Ignores unescaped whitespace and comments outside character classes