^start of line
Group 1(\*(\/\d+)?|([0-5]?\d)(-([0-5]?\d)(\/\d+)?)?(,([0-5]?\d)(-([0-5]?\d)(\/\d+)?)?)*) 1st Alternative\*(\/\d+)? \*the literal * (4210 / 528 / 2A16)
?repeats the group contents below at most once:
\/the literal / (4710 / 578 / 2F16)
\d+a digit, repeated at least once
2nd Alternative([0-5]?\d)(-([0-5]?\d)(\/\d+)?)?(,([0-5]?\d)(-([0-5]?\d)(\/\d+)?)?)* ?matches at most one character from the set below:
0-5one character from 0 (4810) to 5 (5310)
\da digit
Group 4(-([0-5]?\d)(\/\d+)?)? ?repeats the group contents below at most once:
-the literal - (4510 / 558 / 2D16)
?matches at most one character from the set below:
0-5one character from 0 (4810) to 5 (5310)
\da digit
?repeats the group contents below at most once:
\/the literal / (4710 / 578 / 2F16)
\d+a digit, repeated at least once
Group 7(,([0-5]?\d)(-([0-5]?\d)(\/\d+)?)?)* *repeats the group contents below any number of times:
,the literal , (4410 / 548 / 2C16)
?matches at most one character from the set below:
0-5one character from 0 (4810) to 5 (5310)
\da digit
Group 9(-([0-5]?\d)(\/\d+)?)? ?repeats the group contents below at most once:
-the literal - (4510 / 558 / 2D16)
?matches at most one character from the set below:
0-5one character from 0 (4810) to 5 (5310)
\da digit
?repeats the group contents below at most once:
\/the literal / (4710 / 578 / 2F16)
\d+a digit, repeated at least once
\sany whitespace character
Group 12(\*(\/\d+)?|([01]?\d|2[0-3])(-([01]?\d|2[0-3])(\/\d+)?)?(,([01]?\d|2[0-3])(-([01]?\d|2[0-3])(\/\d+)?)?)*) 1st Alternative\*(\/\d+)? \*the literal * (4210 / 528 / 2A16)
?repeats the group contents below at most once:
\/the literal / (4710 / 578 / 2F16)
\d+a digit, repeated at least once
2nd Alternative([01]?\d|2[0-3])(-([01]?\d|2[0-3])(\/\d+)?)?(,([01]?\d|2[0-3])(-([01]?\d|2[0-3])(\/\d+)?)?)* ?matches at most one character from the set below:
0the literal 0 (4810 / 608 / 3016)
1the literal 1 (4910 / 618 / 3116)
\da digit
2the literal 2 (5010 / 628 / 3216)
Group 15(-([01]?\d|2[0-3])(\/\d+)?)? Group 18(,([01]?\d|2[0-3])(-([01]?\d|2[0-3])(\/\d+)?)?)* \sany whitespace character
Group 23(\*(\/\d+)?|(0?[1-9]|[12]\d|3[01])(-(0?[1-9]|[12]\d|3[01])(\/\d+)?)?(,(0?[1-9]|[12]\d|3[01])(-(0?[1-9]|[12]\d|3[01])(\/\d+)?)?)*) \sany whitespace character
Group 34(\*(\/\d+)?|([1-9]|1[012])(-([1-9]|1[012])(\/\d+)?)?(,([1-9]|1[012])(-([1-9]|1[012])(\/\d+)?)?)*|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec) \sany whitespace character
Group 45(\*(\/\d+)?|([0-7])(-([0-7])(\/\d+)?)?(,([0-7])(-([0-7])(\/\d+)?)?)*|mon|tue|wed|thu|fri|sat|sun) \sany whitespace character
$end of line
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
g modifier: global. Finds all matches instead of stopping after the first