Regular Expressions 101

Explanation

Pro

(?i)applies the following effective flags to the remainder of the pattern: gi

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

Definition Group(?(DEFINE)(?<proto>(?:https?:)?\/\/)(?<port>:[0-9]{2,5})(?<tld>(?:a(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])|b(?:[abd-h]|iz?|[jl-oq-tvwyz])|c(?:at?|[cdf-ik-n]|o(?:m|op)?|[ru-z])|d[ejkmoz]|e[ceghr-u]|f[i-kmor]|g[abd-il-np-uwy]|h[kmnrtu]|i(?:[delm]|n(?:fo|t)?|[oq-t])|j(?:[em]|o(?:bs)?|p)|k[eg-imnprwyz]|l[a-cikr-vy]|m(?:[ac-hk]|lc?|[mn]|o(?:bi)?|[p-t]|u(?:seum)?|[v-z])|n(?:a(?:me)?|c|et?|[fgilopruz])|o(?:m|rg)|p(?:[ae-hk-n]|ost|ro?|[stwy])|qa|r[eosuw]|s(?:[a-eg-or]|t(?:udio)?|[uvx-z])|t(?:[cd]|el|[f-hj-p]|r(?:avel)?|[tvwz])|u[agkmsyz]|v[aceginu]|w[fs]|y[et]|z[amw]))(?<path>(\/(?:[a-z0-9+%-]\.?)+)*\/?)(?<query>\?[a-z+&$_.-][a-z0-9;:@&%=+\/.-]*)(?<hash>\#[a-z_.-][a-z0-9+$%_.-]*)(?<subdomain>[a-z0-9\-\.]+\.)(?<yt_domain>(?:www\.)?(?:youtube\.com|youtu\.be)\/)(?<yt_hash>(?:[\w-]{10,12})+)(?<yt_video>(?&proto)?(?&yt_domain)+(?:watch)?(?:\/embed\/|\?v=)+(?&yt_hash)+))

Group proto(?<proto>(?:https?:)?\/\/)

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)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group port(?<port>:[0-9]{2,5})

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-9]{2,5}

{2,5}matches between 2 and 5 characters from the set below:

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

Group tld(?<tld>(?:a(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])|b(?:[abd-h]|iz?|[jl-oq-tvwyz])|c(?:at?|[cdf-ik-n]|o(?:m|op)?|[ru-z])|d[ejkmoz]|e[ceghr-u]|f[i-kmor]|g[abd-il-np-uwy]|h[kmnrtu]|i(?:[delm]|n(?:fo|t)?|[oq-t])|j(?:[em]|o(?:bs)?|p)|k[eg-imnprwyz]|l[a-cikr-vy]|m(?:[ac-hk]|lc?|[mn]|o(?:bi)?|[p-t]|u(?:seum)?|[v-z])|n(?:a(?:me)?|c|et?|[fgilopruz])|o(?:m|rg)|p(?:[ae-hk-n]|ost|ro?|[stwy])|qa|r[eosuw]|s(?:[a-eg-or]|t(?:udio)?|[uvx-z])|t(?:[cd]|el|[f-hj-p]|r(?:avel)?|[tvwz])|u[agkmsyz]|v[aceginu]|w[fs]|y[et]|z[amw]))

Non-Capturing Group(?:a(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])|b(?:[abd-h]|iz?|[jl-oq-tvwyz])|c(?:at?|[cdf-ik-n]|o(?:m|op)?|[ru-z])|d[ejkmoz]|e[ceghr-u]|f[i-kmor]|g[abd-il-np-uwy]|h[kmnrtu]|i(?:[delm]|n(?:fo|t)?|[oq-t])|j(?:[em]|o(?:bs)?|p)|k[eg-imnprwyz]|l[a-cikr-vy]|m(?:[ac-hk]|lc?|[mn]|o(?:bi)?|[p-t]|u(?:seum)?|[v-z])|n(?:a(?:me)?|c|et?|[fgilopruz])|o(?:m|rg)|p(?:[ae-hk-n]|ost|ro?|[stwy])|qa|r[eosuw]|s(?:[a-eg-or]|t(?:udio)?|[uvx-z])|t(?:[cd]|el|[f-hj-p]|r(?:avel)?|[tvwz])|u[agkmsyz]|v[aceginu]|w[fs]|y[et]|z[amw])

1st Alternativea(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

Non-Capturing Group(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])

1st Alternative[cd]

Character Class[cd]

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case insensitive)

2nd Alternativee(?:ro)?

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

Non-Capturing Group(?:ro)?

?repeats the group contents below at most once:

rothe literal text ro (case insensitive)

3rd Alternative[fgil-oqr]

Character Class[fgil-oqr]

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case insensitive)

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case insensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case insensitive)

l-oone character from l (108₁₀) to o (111₁₀) (case insensitive)

qthe literal q (113₁₀ / 161₈ / 71₁₆) (case insensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case insensitive)

4th Alternatives(?:ia)?

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

Non-Capturing Group(?:ia)?

?repeats the group contents below at most once:

iathe literal text ia (case insensitive)

5th Alternative[tuwxz]

Character Class[tuwxz]

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

uthe literal u (117₁₀ / 165₈ / 75₁₆) (case insensitive)

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

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

zthe literal z (122₁₀ / 172₈ / 7A₁₆) (case insensitive)

2nd Alternativeb(?:[abd-h]|iz?|[jl-oq-tvwyz])

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case insensitive)

Non-Capturing Group(?:[abd-h]|iz?|[jl-oq-tvwyz])

1st Alternative[abd-h]

Character Class[abd-h]

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case insensitive)

d-hone character from d (100₁₀) to h (104₁₀) (case insensitive)

2nd Alternativeiz?

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case insensitive)

z?optionally matches the literal z (122₁₀ / 172₈ / 7A₁₆) (case insensitive)

3rd Alternative[jl-oq-tvwyz]

3rd Alternativec(?:at?|[cdf-ik-n]|o(?:m|op)?|[ru-z])

4th Alternatived[ejkmoz]

5th Alternativee[ceghr-u]

6th Alternativef[i-kmor]

7th Alternativeg[abd-il-np-uwy]

8th Alternativeh[kmnrtu]

9th Alternativei(?:[delm]|n(?:fo|t)?|[oq-t])

10th Alternativej(?:[em]|o(?:bs)?|p)

11th Alternativek[eg-imnprwyz]

12th Alternativel[a-cikr-vy]

13th Alternativem(?:[ac-hk]|lc?|[mn]|o(?:bi)?|[p-t]|u(?:seum)?|[v-z])

14th Alternativen(?:a(?:me)?|c|et?|[fgilopruz])

15th Alternativeo(?:m|rg)

16th Alternativep(?:[ae-hk-n]|ost|ro?|[stwy])

17th Alternativeqa

18th Alternativer[eosuw]

19th Alternatives(?:[a-eg-or]|t(?:udio)?|[uvx-z])

20th Alternativet(?:[cd]|el|[f-hj-p]|r(?:avel)?|[tvwz])

21st Alternativeu[agkmsyz]

22nd Alternativev[aceginu]

23rd Alternativew[fs]

24th Alternativey[et]

25th Alternativez[amw]

Group path(?<path>(\/(?:[a-z0-9+%-]\.?)+)*\/?)

Group query(?<query>\?[a-z+&$_.-][a-z0-9;:@&%=+\/.-]*)

Group hash(?<hash>\#[a-z_.-][a-z0-9+$%_.-]*)

Group subdomain(?<subdomain>[a-z0-9\-\.]+\.)

Group yt_domain(?<yt_domain>(?:www\.)?(?:youtube\.com|youtu\.be)\/)

Group yt_hash(?<yt_hash>(?:[\w-]{10,12})+)

Group yt_video(?<yt_video>(?&proto)?(?&yt_domain)+(?:watch)?(?:\/embed\/|\?v=)+(?&yt_hash)+)

Group 12((?&yt_video).*(*SKIP)(*FAIL)|(?&proto)?(?&subdomain)(?&tld)(?&port)?(?&path)?(?&query)?(?&hash)?)

Global pattern flags

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?i)(?(DEFINE)(?<proto>(?:https?:)?\/\/)(?<port>:[0-9]{2,5})(?<tld>(?:a(?:[cd]|e(?:ro)?|[fgil-oqr]|s(?:ia)?|[tuwxz])|b(?:[abd-h]|iz?|[jl-oq-tvwyz])|c(?:at?|[cdf-ik-n]|o(?:m|op)?|[ru-z])|d[ejkmoz]|e[ceghr-u]|f[i-kmor]|g[abd-il-np-uwy]|h[kmnrtu]|i(?:[delm]|n(?:fo|t)?|[oq-t])|j(?:[em]|o(?:bs)?|p)|k[eg-imnprwyz]|l[a-cikr-vy]|m(?:[ac-hk]|lc?|[mn]|o(?:bi)?|[p-t]|u(?:seum)?|[v-z])|n(?:a(?:me)?|c|et?|[fgilopruz])|o(?:m|rg)|p(?:[ae-hk-n]|ost|ro?|[stwy])|qa|r[eosuw]|s(?:[a-eg-or]|t(?:udio)?|[uvx-z])|t(?:[cd]|el|[f-hj-p]|r(?:avel)?|[tvwz])|u[agkmsyz]|v[aceginu]|w[fs]|y[et]|z[amw]))(?<path>(\/(?:[a-z0-9+%-]\.?)+)*\/?)(?<query>\?[a-z+&$_.-][a-z0-9;:@&%=+\/.-]*)(?<hash>\#[a-z_.-][a-z0-9+$%_.-]*)(?<subdomain>[a-z0-9\-\.]+\.)(?<yt_domain>(?:www\.)?(?:youtube\.com|youtu\.be)\/)(?<yt_hash>(?:[\w-]{10,12})+)(?<yt_video>(?&proto)?(?&yt_domain)+(?:watch)?(?:\/embed\/|\?v=)+(?&yt_hash)+))((?&yt_video).*(*SKIP)(*FAIL)|(?&proto)?(?&subdomain)(?&tld)(?&port)?(?&path)?(?&query)?(?&hash)?)

New

Lines which should be partially or fully matched:


http:www.google.com/
 http//www.google.com/
http://www.google.com/
 ://www.google.com/
 www.google.com/
 www.google.com:8000
 www.google.com/?key=value
 github.io
 www.google.com/abc/def/ijk#123
 www.google.com/abc/def/ijk?v=123123123
 www.google.com/abc/def/watch?v=1231231231
https://www.youtube.com/channel/UCgeu2xe0XRscaKyvBt3WgmQ
http://www.google.com/?key=value
http://www.youtube.com/ 

However, it should skip (do not match lines) which contain youtube video ID):


http://www.youtube.com/watch?v=B5Gj78s6H7w&feature=youtu.be
https://www.youtube.com/embed/y19EaW2X7ac
 music.youtube.com/embed/y19EaW2X7ac
https://www.youtube.com/watch?v=B5Gj78s6H7w&feature=youtu.be
https://www.youtube.com/watch?feature=youtu.be&v=B5Gj78s6H7w
https://www.youtu.be/B5Gj78s6H7w&feature=youtu.be
https://www.youtu.be/B5Gj78s6H7w