Regular Expressions 101

com/the literal text com/ (case sensitive)

Non-Capturing Group(?:[^/]+/)?

?repeats the group contents below at most once:

Negated Character Class[^/]+

+matches at least one character outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Negated Character Class[^/\s?]+

+matches at least one character outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

\sany whitespace character

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

com/(?:[^/]+/)?\K[^/\s?]+

Test String
New

http://www.youtube.com/user/TheJuicyJVEVO
https://www.youtube.com/channel/UC4SusBgD3b1G5cCh_gjA81g
http://www.youtube.com/user/fabrikaband?gl=RU&hl=ru
https://www.youtube.com/channel/UCd2R33j8_ZtNtP2HmXNqAGA/featured
https://www.youtube.com/channel/UCd2R33j8_ZtNtP2HmXNqAGA/videos?a=b&b=c
https://www.youtube.com/duranduran
https://www.youtube.com/r3hab

Regular Expression

Test StringNew

Test String
New