Regular Expressions 101

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/
(?:http(?:s|):\/\/(?:www\.|)example\.com\/)([^\/]+)\/(season-[0-9]{1,}|)((.+)\.html)
/
gm
Non-capturing group
(?:http(?:s|):\/\/(?:www\.|)example\.com\/)
http
matches the characters http literally (case sensitive)
Non-capturing group
(?:s|)
1st Alternative
s
s matches the character s with index 11510 (7316 or 1638) literally (case sensitive)
2nd Alternative null, matches any position
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Non-capturing group
(?:www\.|)
1st Alternative
www\.
www
matches the characters www literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
2nd Alternative null, matches any position
example
matches the characters example literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
com
matches the characters com literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
1st Capturing Group
([^\/]+)
Match a single character not present in the list below
[^\/]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
2nd Capturing Group
(season-[0-9]{1,}|)
1st Alternative
season-[0-9]{1,}
season-
matches the characters season- literally (case sensitive)
Match a single character present in the list below
[0-9]
{1,} matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
2nd Alternative null, matches any position
3rd Capturing Group
((.+)\.html)
4th Capturing Group
(.+)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
html
matches the characters html literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String