regex101: Python Match Workspace

^start of line

Non-Capturing Group(?:https?:)?

?repeats the group contents below at most once:

httpthe literal text http (case insensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:\/\/)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

?repeats the group contents below at most once:

1st Alternativewww\.

wwwthe literal text www (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternativem\.

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

youtubethe literal text youtube (case insensitive)

Non-Capturing Group(?:-nocookie)?

?repeats the group contents below at most once:

-nocookiethe literal text -nocookie (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

1st Alternativev\/

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativee\/

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

3rd Alternativeembed\/

embedthe literal text embed (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

4th Alternativew\/

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

5th Alternative(?:watch\?v=|(?:(?:\?|watch\?)(?:[\w]+=[\w]+&?)+)v=)?

Non-Capturing Group(?:watch\?v=|(?:(?:\?|watch\?)(?:[\w]+=[\w]+&?)+)v=)?

?repeats the group contents below at most once:

1st Alternativewatch\?v=

watchthe literal text watch (case insensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

v=the literal text v= (case insensitive)

2nd Alternative(?:(?:\?|watch\?)(?:[\w]+=[\w]+&?)+)v=

Non-Capturing Group(?:(?:\?|watch\?)(?:[\w]+=[\w]+&?)+)

Non-Capturing Group(?:\?|watch\?)

1st Alternative\?

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

2nd Alternativewatch\?

watchthe literal text watch (case insensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Non-Capturing Group(?:[\w]+=[\w]+&?)+

+repeats the group contents below at least once:

Character Class[\w]+

+matches at least one character from the set below:

\wa Unicode word character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[\w]+

+matches at least one character from the set below:

\wa Unicode word character

&?optionally matches the literal & (38₁₀ / 46₈ / 26₁₆)

v=the literal text v= (case insensitive)

6th Alternativeshorts\/

shortsthe literal text shorts (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativeyoutu\.be\/(?:watch\?v=)?

Group 1([\w-]{11})

Positive Lookahead(?=[^\w-]|$)

Negative Lookahead(?![?=&+%\w.-]*(?:['\"][^<>]*>|<\/a>))

Character Class[?=&+%\w.-]*

$end of line

Global pattern flags

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

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

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

Search reference

Regular Expression

^(?:https?:)?(?:\/\/)?(?:(?:www\.|m\.)?youtube(?:-nocookie)?\.com\/(?:v\/|e\/|embed\/|w\/|(?:watch\?v=|(?:(?:\?|watch\?)(?:[\w]+=[\w]+&?)+)v=)?|shorts\/)|youtu\.be\/(?:watch\?v=)?)([\w-]{11})(?=[^\w-]|$)(?![?=&+%\w.-]*(?:['\"][^<>]*>|<\/a>))[?=&+%\w.-]*$

Unit Tests

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