Regular Expressions 101

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/
^(https:\/\/)?([\da-z\.-])\.([a-z\.])([\/\w \.-])*\/$
/
mg
^ asserts position at start of a line
1st Capturing Group
(https:\/\/)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
http matches the characters http literally (case sensitive)
s
matches the character s literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
: matches the character : literally (case sensitive)
\/ matches the character / literally (case sensitive)
\/ matches the character / literally (case sensitive)
2nd Capturing Group
([\da-z\.-])
Match a single character present in the list below
[\da-z\.-]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
\. matches the character . literally (case sensitive)
- matches the character - literally (case sensitive)
\. matches the character . literally (case sensitive)
3rd Capturing Group
([a-z\.])
Match a single character present in the list below
[a-z\.]
{2,6} matches the previous token between 2 and 6 times, as many times as possible, giving back as needed (greedy)
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
\. matches the character . literally (case sensitive)
4th Capturing Group
([\/\w \.-])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Match a single character present in the list below
[\/\w \.-]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / literally (case sensitive)
\w matches any word character (equivalent to [a-zA-Z0-9_])
matches the character literally (case sensitive)
\. matches the character . literally (case sensitive)
- matches the character - literally (case sensitive)
\/
matches the character / literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of a line
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
mg

Test String