Regular Expressions 101

Explanation

Pro

Non-Capturing Group(?:https?:\/\/(?:www)?\.?y(?:2u\.be|outu\.be|outube.com)\/)

httpthe literal text http (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www)?

?repeats the group contents below at most once:

wwwthe literal text www (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

ythe literal y (121₁₀ / 171₈ / 79₁₆) (case insensitive)

Non-Capturing Group(?:2u\.be|outu\.be|outube.com)

1st Alternative2u\.be

2uthe literal text 2u (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

bethe literal text be (case insensitive)

2nd Alternativeoutu\.be

oututhe literal text outu (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

bethe literal text be (case insensitive)

3rd Alternativeoutube.com

outubethe literal text outube (case insensitive)

.any character (except for line terminators)

comthe literal text com (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:watch\?v=)?

?repeats the group contents below at most once:

watchthe literal text watch (case insensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

v=the literal text v= (case insensitive)

Group 1([\w\d]+)

Character Class[\w\d]+

+matches at least one character from the set below:

\wany word character

\da digit

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

26 tokens

(?:https?:\/\/(?:www)?\.?y(?:2u\.be|outu\.be|outube.com)\/)(?:watch\?v=)?([\w\d]+)

New

some https://www.youtube.com/watch?v=cYXI344Siew YT link

some https://www.youtube.com/watch?v=cYXI344Siew YT link