Regular Expressions 101

Explanation

Pro

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

?repeats the group contents below at most once:

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/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(?:m\.)?

?repeats the group contents below at most once:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:\S*&)?vi?=|(?:embed|v|vi|user|shorts)\/))

1st Alternativeyoutu\.be\/

yoututhe literal text youtu (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

bethe literal text be (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativeyoutube\.com\/(?:(?:watch)?\?(?:\S*&)?vi?=|(?:embed|v|vi|user|shorts)\/)

youtubethe literal text youtube (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:(?:watch)?\?(?:\S*&)?vi?=|(?:embed|v|vi|user|shorts)\/)

1st Alternative(?:watch)?\?(?:\S*&)?vi?=

Non-Capturing Group(?:watch)?

?repeats the group contents below at most once:

watchthe literal text watch (case sensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Non-Capturing Group(?:\S*&)?

?repeats the group contents below at most once:

\S*any non-whitespace character, repeated any number of times

&the literal & (38₁₀ / 46₈ / 26₁₆)

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

i?optionally matches the literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

2nd Alternative(?:embed|v|vi|user|shorts)\/

Non-Capturing Group(?:embed|v|vi|user|shorts)

1st Alternativeembed

embedthe literal text embed (case sensitive)

2nd Alternativev

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

3rd Alternativevi

vithe literal text vi (case sensitive)

4th Alternativeuser

userthe literal text user (case sensitive)

5th Alternativeshorts

shortsthe literal text shorts (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([^?&\"'>\s]+)

Negated Character Class[^?&\"'>\s]+

+matches at least one character outside the set below:

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\sany whitespace character

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

s modifier: single line. Allows a dot to match line terminators

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?:https?:\/\/)?(?:www\.)?(?:m\.)?(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:\S*&)?vi?=|(?:embed|v|vi|user|shorts)\/))([^?&\"'>\s]+)

New

this is a test https://www.youtube.com/watch?v=d4bv2NaO9fQ this is a test