Regular Expressions 101

Explanation

Pro

Definition Group(?(DEFINE) # URL (?<proto> (https?:)?\/\/) (?<tld> (?:aero|asia|biz|cat|com|coop|info|int|jobs|mobi|museum|name|net|org|post|pro|studio|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bl|bm|bn|bo|bq|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cw|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mf|mg|mh|mk|ml|mlc|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw)) (?<port> :[0-9]{2,5}) (?<path> (\/([a-z0-9+%-]\.?)+)*\/?) (?<query> \?[a-z+&$_.-][a-z0-9;:@&%=+\/.-]*) (?<hash> \#[a-z_.-][a-z0-9+$%_.-]*) (?<subdomain> ([a-z0-9\-\.]+)\.) # Exceptions (?<yt_domain> (www\.)?(youtube\.com|youtu\.be)\/) (?<yt_hash> ([\w-]{10,12})+) (?<yt_video> \g<proto>?\g<yt_domain>+(watch)?(\/embed\/|\?v=)+\g<yt_hash>+) )

Comment: URL

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

Group 2(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 tld(?<tld> (?:aero|asia|biz|cat|com|coop|info|int|jobs|mobi|museum|name|net|org|post|pro|studio|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bl|bm|bn|bo|bq|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cw|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mf|mg|mh|mk|ml|mlc|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw))

Non-Capturing Group(?:aero|asia|biz|cat|com|coop|info|int|jobs|mobi|museum|name|net|org|post|pro|studio|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bl|bm|bn|bo|bq|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cw|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mf|mg|mh|mk|ml|mlc|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw)

1st Alternativeaero

aerothe literal text aero (case insensitive)

2nd Alternativeasia

asiathe literal text asia (case insensitive)

3rd Alternativebiz

bizthe literal text biz (case insensitive)

4th Alternativecat

catthe literal text cat (case insensitive)

5th Alternativecom

comthe literal text com (case insensitive)

6th Alternativecoop

coopthe literal text coop (case insensitive)

7th Alternativeinfo

infothe literal text info (case insensitive)

8th Alternativeint

intthe literal text int (case insensitive)

9th Alternativejobs

jobsthe literal text jobs (case insensitive)

10th Alternativemobi

mobithe literal text mobi (case insensitive)

11th Alternativemuseum

museumthe literal text museum (case insensitive)

12th Alternativename

namethe literal text name (case insensitive)

13th Alternativenet

netthe literal text net (case insensitive)

14th Alternativeorg

orgthe literal text org (case insensitive)

15th Alternativepost

postthe literal text post (case insensitive)

16th Alternativepro

prothe literal text pro (case insensitive)

17th Alternativestudio

studiothe literal text studio (case insensitive)

18th Alternativetel

telthe literal text tel (case insensitive)

19th Alternativetravel

travelthe literal text travel (case insensitive)

20th Alternativeac

acthe literal text ac (case insensitive)

21st Alternativead

22nd Alternativeae

23rd Alternativeaf

24th Alternativeag

25th Alternativeai

26th Alternativeal

27th Alternativeam

28th Alternativean

29th Alternativeao

30th Alternativeaq

31st Alternativear

32nd Alternativeas

33rd Alternativeat

34th Alternativeau

35th Alternativeaw

36th Alternativeax

37th Alternativeaz

38th Alternativeba

39th Alternativebb

40th Alternativebd

41st Alternativebe

42nd Alternativebf

43rd Alternativebg

44th Alternativebh

45th Alternativebi

46th Alternativebj

47th Alternativebl

48th Alternativebm

49th Alternativebn

50th Alternativebo

51st Alternativebq

52nd Alternativebr

53rd Alternativebs

54th Alternativebt

55th Alternativebv

56th Alternativebw

57th Alternativeby

58th Alternativebz

59th Alternativeca

60th Alternativecc

61st Alternativecd

62nd Alternativecf

63rd Alternativecg

64th Alternativech

65th Alternativeci

66th Alternativeck

67th Alternativecl

68th Alternativecm

69th Alternativecn

70th Alternativeco

71st Alternativecr

72nd Alternativecu

73rd Alternativecv

74th Alternativecw

75th Alternativecx

76th Alternativecy

77th Alternativecz

78th Alternativede

79th Alternativedj

80th Alternativedk

81st Alternativedm

82nd Alternativedo

83rd Alternativedz

84th Alternativeec

85th Alternativeee

86th Alternativeeg

87th Alternativeeh

88th Alternativeer

89th Alternativees

90th Alternativeet

91st Alternativeeu

92nd Alternativefi

93rd Alternativefj

94th Alternativefk

95th Alternativefm

96th Alternativefo

97th Alternativefr

98th Alternativega

99th Alternativegb

100th Alternativegd

101st Alternativege

102nd Alternativegf

103rd Alternativegg

104th Alternativegh

105th Alternativegi

106th Alternativegl

107th Alternativegm

108th Alternativegn

109th Alternativegp

110th Alternativegq

111th Alternativegr

112th Alternativegs

113th Alternativegt

114th Alternativegu

115th Alternativegw

116th Alternativegy

117th Alternativehk

118th Alternativehm

119th Alternativehn

120th Alternativehr

121st Alternativeht

122nd Alternativehu

123rd Alternativeid

124th Alternativeie

125th Alternativeil

126th Alternativeim

127th Alternativein

128th Alternativeio

129th Alternativeiq

130th Alternativeir

131st Alternativeis

132nd Alternativeit

133rd Alternativeje

134th Alternativejm

135th Alternativejo

136th Alternativejp

137th Alternativeke

138th Alternativekg

139th Alternativekh

140th Alternativeki

141st Alternativekm

142nd Alternativekn

143rd Alternativekp

144th Alternativekr

145th Alternativekw

146th Alternativeky

147th Alternativekz

148th Alternativela

149th Alternativelb

150th Alternativelc

151st Alternativeli

152nd Alternativelk

153rd Alternativelr

154th Alternativels

155th Alternativelt

156th Alternativelu

157th Alternativelv

158th Alternatively

159th Alternativema

160th Alternativemc

161st Alternativemd

162nd Alternativeme

163rd Alternativemf

164th Alternativemg

165th Alternativemh

166th Alternativemk

167th Alternativeml

168th Alternativemlc

169th Alternativemm

170th Alternativemn

171st Alternativemo

172nd Alternativemp

173rd Alternativemq

174th Alternativemr

175th Alternativems

176th Alternativemt

177th Alternativemu

178th Alternativemv

179th Alternativemw

180th Alternativemx

181st Alternativemy

182nd Alternativemz

183rd Alternativena

184th Alternativenc

185th Alternativene

186th Alternativenf

187th Alternativeng

188th Alternativeni

189th Alternativenl

190th Alternativeno

191st Alternativenp

192nd Alternativenr

193rd Alternativenu

194th Alternativenz

195th Alternativeom

196th Alternativepa

197th Alternativepe

198th Alternativepf

199th Alternativepg

200th Alternativeph

201st Alternativepk

202nd Alternativepl

203rd Alternativepm

204th Alternativepn

205th Alternativepr

206th Alternativeps

207th Alternativept

208th Alternativepw

209th Alternativepy

210th Alternativeqa

211th Alternativere

212th Alternativero

213th Alternativers

214th Alternativeru

215th Alternativerw

216th Alternativesa

217th Alternativesb

218th Alternativesc

219th Alternativesd

220th Alternativese

221st Alternativesg

222nd Alternativesh

223rd Alternativesi

224th Alternativesj

225th Alternativesk

226th Alternativesl

227th Alternativesm

228th Alternativesn

229th Alternativeso

230th Alternativesr

231st Alternativest

232nd Alternativesu

233rd Alternativesv

234th Alternativesx

235th Alternativesy

236th Alternativesz

237th Alternativetc

238th Alternativetd

239th Alternativetf

240th Alternativetg

241st Alternativeth

242nd Alternativetj

243rd Alternativetk

244th Alternativetl

245th Alternativetm

246th Alternativetn

247th Alternativeto

248th Alternativetp

249th Alternativetr

250th Alternativett

251st Alternativetv

252nd Alternativetw

253rd Alternativetz

254th Alternativeua

255th Alternativeug

256th Alternativeuk

257th Alternativeum

258th Alternativeus

259th Alternativeuy

260th Alternativeuz

261st Alternativeva

262nd Alternativevc

263rd Alternativeve

264th Alternativevg

265th Alternativevi

266th Alternativevn

267th Alternativevu

268th Alternativewf

269th Alternativews

270th Alternativeye

271st Alternativeyt

272nd Alternativeza

273rd Alternativezm

274th Alternativezw

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

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\-\.]+)\.)

Comment: Exceptions

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

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

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

Comment: Capture

Negative Lookahead(?!\g<yt_video>+.*)

Group 20(\g<proto>? \g<subdomain> \g<tld> \g<port>? \g<path>? \g<query>? \g<hash>? )

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?(DEFINE)
  # URL
  (?<proto> (https?:)?\/\/)
  (?<tld> (?:aero|asia|biz|cat|com|coop|info|int|jobs|mobi|museum|name|net|org|post|pro|studio|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bl|bm|bn|bo|bq|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cw|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mf|mg|mh|mk|ml|mlc|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw))
  (?<port> :[0-9]{2,5})
  (?<path> (\/([a-z0-9+%-]\.?)+)*\/?)
  (?<query> \?[a-

New

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/watch?v=B5Gj78s6H7w&feature=youtu.be
https://www.youtube.com/watch?feature=youtu.be&v=B5Gj78s6H7w
<iframe src="https://www.youtube.com/watch?v=B5Gj78s6H7w&feature=youtu.be">
https://www.youtu.be/B5Gj78s6H7w&feature=youtu.be">
https://www.youtu.be/B5Gj78s6H7w
https://www.youtube.com/channel/UCgeu2xe0XRscaKyvBt3WgmQ
<a href="https://www.youtube.com/channel/UCgeu2xe0XRscaKyvBt3WgmQ">
http://www.google.com/?key=value
http://www.youtube.com/watch?v=B5Gj78s6H7w&feature=youtu.be

https://www.youtube.com/embed/y19EaW2X7ac
music.youtube.com/embed/y19EaW2X7ac