Regular Expressions 101

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/
^https:\/\/(?:www\.)?kuula.co\/share\/(?:[A-Za-z0-9]\/)?(?:collection\/)?([A-Za-z0-9])(\?.)?$
/
gm
^ asserts position at start of a line
https: matches the characters https: literally (case sensitive)
\/ matches the character / literally (case sensitive)
\/ matches the character / literally (case sensitive)
Non-capturing group
(?:www\.)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
www matches the characters www literally (case sensitive)
\. matches the character . literally (case sensitive)
kuula matches the characters kuula literally (case sensitive)
. matches any character (except for line terminators)
co matches the characters co literally (case sensitive)
\/ matches the character / literally (case sensitive)
share matches the characters share literally (case sensitive)
\/ matches the character / literally (case sensitive)
Non-capturing group
(?:[A-Za-z0-9]\/)?
Non-capturing group
(?:collection\/)?
1st Capturing Group
([A-Za-z0-9])
2nd Capturing Group
(\?.)?
$ asserts position at the end of a line
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

Regular Expressions 101

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