regex101: PCRE (Legacy) Match Workspace

(?im)applies the following effective flags to the remainder of the pattern: gim

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

\ban ASCII word boundary

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)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:w{3}\.)?

?repeats the group contents below at most once:

w{3}the literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive), repeated exactly 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

yoututhe literal text youtu (case insensitive)

Non-Capturing Group(?:be)?

?repeats the group contents below at most once:

bethe literal text be (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:com|be)

1st Alternativecom

comthe literal text com (case insensitive)

2nd Alternativebe

bethe literal text be (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:(?:\??v=?i?=?\/?)|watch\?vi?=|watch\?.*?&v=|embed\/|)

1st Alternative(?:\??v=?i?=?\/?)

Non-Capturing Group(?:\??v=?i?=?\/?)

\??optionally matches the literal ? (63₁₀ / 77₈ / 3F₁₆)

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

=?optionally matches the literal = (61₁₀ / 75₈ / 3D₁₆)

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

=?optionally matches the literal = (61₁₀ / 75₈ / 3D₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativewatch\?vi?=

watchthe literal text watch (case insensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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

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

=the literal = (61₁₀ / 75₈ / 3D₁₆)

3rd Alternativewatch\?.*?&v=

watchthe literal text watch (case insensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

.*?any character (except for line terminators), repeated any number of times

&v=the literal text &v= (case insensitive)

4th Alternativeembed\/

embedthe literal text embed (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

5th Alternative — matches an empty string

Group 1([A-Z0-9_-]{11})

Character Class[A-Z0-9_-]{11}

{11}matches exactly 11 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Global pattern flags

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

25 tokens

Regular Expression

(?im)\b(?:https?:\/\/)?(?:w{3}\.)?youtu(?:be)?\.(?:com|be)\/(?:(?:\??v=?i?=?\/?)|watch\?vi?=|watch\?.*?&v=|embed\/|)([A-Z0-9_-]{11})

New

http://youtube.com/v/tFad5gHoBjY
https://youtube.com/vi/tFad5gHoBjY
http://www.youtube.com/?v=tFad5gHoBjY
http://www.youtube.com/?vi=tFad5gHoBjY
https://www.youtube.com/watch?v=tFad5gHoBjY
youtube.com/watch?vi=tFad5gHoBjY
youtu.be/tFad5gHoBjY
http://youtu.be/qokEYBNWA_0?t=30m26s
youtube.com/v/7HCZvhRAk-M
youtube.com/vi/7HCZvhRAk-M
youtube.com/?v=7HCZvhRAk-M
youtube.com/?vi=7HCZvhRAk-M
youtube.com/watch?v=7HCZvhRAk-M
youtube.com/watch?vi=7HCZvhRAk-M
youtu.be/7HCZvhRAk-M
youtube.com/embed/7HCZvhRAk-M
http://youtube.com/v/7HCZvhRAk-M
http://www.youtube.com/v/7HCZvhRAk-M
https://www.youtube.com/v/7HCZvhRAk-M
youtube.com/watch?v=7HCZvhRAk-M&wtv=wtv
http://www.youtube.com/watch?dev=inprogress&v=7HCZvhRAk-M&feature=related
youtube.com/watch?v=7HCZvhRAk-M
http://youtube.com/v/dQw4w9WgXcQ?feature=youtube_gdata_player
http://youtube.com/vi/dQw4w9WgXcQ?feature=youtube_gdata_player
http://youtube.com/?v=dQw4w9WgXcQ&feature=youtube_gdata_player
http://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player
http://youtube.com/?vi=dQw4w9WgXcQ&feature=youtube_gdata_player
http://youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player
http://youtube.com/watch?vi=dQw4w9WgXcQ&feature=youtube_gdata_player
http://youtu.be/dQw4w9WgXcQ?feature=youtube_gdata_player

Regular Expressions 101

Regular Expression

Substitution