Regular Expressions 101

Pro

^start of line

https:the literal text https: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:youtube(?:-nocookie)?\.com\/(?:watch\?v=|embed\/)|youtu\.be\/)

1st Alternativeyoutube(?:-nocookie)?\.com\/(?:watch\?v=|embed\/)

youtubethe literal text youtube (case sensitive)

Non-Capturing Group(?:-nocookie)?

?repeats the group contents below at most once:

-nocookiethe literal text -nocookie (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

1st Alternativewatch\?v=

watchthe literal text watch (case sensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

v=the literal text v= (case sensitive)

2nd Alternativeembed\/

embedthe literal text embed (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativeyoutu\.be\/

yoututhe literal text youtu (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

bethe literal text be (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([\w-]+)

Character Class[\w-]+

+matches at least one character from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\?.+)?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

.+any character (except for line terminators), repeated at least once

$end of line

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

No unit tests · Add a test to get started

25 tokens

^https:\/\/(?:www\.)?(?:youtube(?:-nocookie)?\.com\/(?:watch\?v=|embed\/)|youtu\.be\/)([\w-]+)(?:\?.+)?$

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