Regular Expressions 101

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/
(https):\/\/([\w-](\.[\\w-])*\.([a-z]))(([\w.,@?^=%&amp;:\/~+#()!-])([\w@?^=%&amp;\/~+#()!-]))?
/
gi
1st Capturing Group
(https)
http matches the characters http literally (case insensitive)
s
matches the character s literally (case insensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
: matches the character : literally (case insensitive)
\/ matches the character / literally (case insensitive)
\/ matches the character / literally (case insensitive)
2nd Capturing Group
([\w-](\.[\\w-])*\.([a-z]))
Match a single character present in the list below
[\w-]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\w matches any word character (equivalent to [a-zA-Z0-9_])
- matches the character - literally (case insensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
3rd 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
\. matches the character . literally (case insensitive)
Match a single character present in the list below
[\\w-]
\. matches the character . literally (case insensitive)
4th Capturing Group
([a-z])
5th Capturing Group
(([\w.,@?^=%&amp;:\/~+#()!-])([\w@?^=%&amp;\/~+#()!-]))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
6th Capturing Group
([\w.,@?^=%&amp;:\/~+#()!-])
Match a single character present in the list below
[\w.,@?^=%&amp;:\/~+#()!-]
7th Capturing Group
([\w@?^=%&amp;\/~+#()!-])
matches the character literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gi

Test String