Collected solutions for Regex Golf, Classic level set
See also:
jpsim gist (discussion)
jonathanmorley gist (discussion)
teukon's Draft Regex Golf Bonus Levels
Solutions to teukon's Draft Regex Golf Bonus Levels (SPOILERS! SPOILERS!) and discussion of mathematical regexes
Continued discussion of Regex Golf Bonus Levels and mathematical regexes (SPOILERS! SPOILERS!)
Please let me know if you find any errors here, or can fill in any of the missing data.
Timestamps are in UTC. Be careful when following GitHub comment links – spoilers may be seen for other levels.
If I manage to discover solutions matching the unpublished high-score holders in length, I'm leaning towards publishing them here only as md5sums, so as not to further taint the high-score lists on Regex Golf.
There are some very wide tables below, which are uncomfortably constrained by the GitHub frameworks CSS. So I would suggest using a browser plugin to override the style with gist-wide.css.
Key to credits:
- P = Usenet: comp.lang.perl.misc
- HN = Hacker News
- R = reddit
- GH = GitHub
- RG~ = Regex Golf old high score list, no longer online (the existence of these records was not publicly known until andersk's 2014-01-07 12:27:38 post)
- RG = Regex Golf current high score list
| Level | Length | Regex | Date | Credit |
|---|---|---|---|---|
| Plain strings | 3 | one of the below | before 2013-12-20 | alok (RG~) |
| 3 | foo |
2013-12-20 11:18:54 | Rhomboid (R) | |
foo |
2013-12-20 14:01:04 | ZirconCode (HN) | ||
f.o |
2014-01 | Peter Norvig | ||
| Anchors | 2 | k$ |
before 2013-12-20 | alok (RG~) |
| It never ends | 6 | u(?!.) |
||
| 3 | u\b |
|||
| Ranges | 8 | one of the below | before 2013-12-20 | alok (RG~) |
| 8 | ^[a-f]*$ |
2013-12-20 11:18:54 | Rhomboid (R) | |
[a-f]{4} |
2013-12-20 14:09:44 | Sir_Cmpwn (HN) | ||
[a-g]{4} |
||||
[a-h]{4} |
||||
^[a-g]*$ |
2013-12-20 15:47:57 | chingjun (HN) | ||
^[a-f]*$ |
2013-12-20 18:09:39 | josephlord (HN) | ||
^[a-h]*$ |
||||
| Backrefs | 9 | (...).*\1 |
before 2013-12-20 | alok (RG~) |
| Abba | 14 | ^(?!(.)+\1)|ef |
2013-12-26 14:37:35 | sammiya (GH) |
| 14 | one of the above or below | 2014-01-07 12:27:38 | cesium (RG~) (discovery date is earlier than indicated date) | |
| 14 | ^(?!(.)+\1)|.u |
2017-07-27 13:21:15 | depperm (GH) | |
| 14 | ^(?!(.)+\1)|fu |
|||
| A man, a plan | 13 | almost certainly one of the below | before 2013-12-20 | Scott (RG~) |
| 13 | ^(.)[^p].*\1$ |
2013-12-20 12:10:04 | Bisqwit (R) | |
^(.)[^p].*\1$ |
2013-12-20 15:43:30 | hyp0 (HN) | ||
^(.)[^p].+\1$ |
||||
| 15 | ^(\w(?!p)).*\1$ |
2013-12-20 18:48:59 | Athox (R) - edited 2013-12-20 20:23:59 | |
| Prime | 14 | ^(?!(11+)\1+$)**** |
1997-10-22 18:17:07 | Abigail (P) |
| 14 | one of the below | before 2013-12-20 | alok (RG~) | |
| 14 | ^(?!(xx+)\1+$) |
2013-12-20 11:18:54 | Rhomboid (R) | |
| 14 | ^(?!(xx+)\1+$) |
2013-12-20 12:10:04 | Bisqwit (R) | |
| 14 | ^(?!(x+x)\1+$) |
|||
| 14 | ^(?!(.+.)\1+$) |
|||
| 14 | ^(?!(..+)\1+$) |
|||
| 16 | ^(?!(..+)(\1)+$) |
2013-12-20 16:14:12 | josephlord (HN) | |
| Four | 11 | (.)(.\1){3} |
before 2013-12-20 | alok (RG~) |
| 14 | ([aeio]).{5}\1 |
2013-12-20 11:18:54 | Rhomboid (R) | |
| 11 | (.)(.\1){3} |
2013-12-20 12:10:04 | Bisqwit (R) | |
(.)(.\1){3} |
2013-12-20 13:13:38 | osuushi (R) | ||
(.)(.\1){3} |
2013-12-20 15:05:14 | chrismorgan (HN) | ||
| Order | 11 | ^[^o]?.{5}$ |
before 2013-12-20 | andersk (RG~,GH) |
| 11 | ^.{5}[^e]?$ |
2013-12-20 12:10:04 | Bisqwit (R) | |
| 11 | ^.{5}[^e]?$ |
2013-12-20 16:13:09 | noggin-scratcher (R) | |
^.{5}[^e]?$ |
2013-12-20 21:50:12 | ekke (HN) | ||
^[^o]?.{5}$ |
2013-12-20 22:13:14 | balrok (GH) | ||
| Triples | 34 | [02-5][123][257]|[07][0269]+3?$|55 |
before 2013-12-20 | andersk (RG~,GH) |
| 56 | ^(([147]4|40|3[269]|9[05]|[378]1).+|0[369]*|[81][257])*$ |
2013-12-20 12:10:04 | Bisqwit (R) | |
| 44 | ^[387][12479]|00($|[369]|1[25])|5[54]|2[437] |
2013-12-21 10:05:27 | grobie (GH) | |
| 40 | 00($|[369]|1[25])|(^.|9|3)..5|4.2|^[38]1 |
2013-12-23 03:15:47 | alexandrosm (GH) | |
| 39 | 32|.[25][345].|00([369]|1[25]|$)|[07]2$ |
2013-12-23 07:10:33 | rabcyr (GH) | |
| 36 | 00([369]|1[25]|$)|.1.+4|3.*7.|4.2|55 |
2013-12-23 12:55:08 | alexandrosm (GH) | |
| 34 | 00($|3|6|9|12|15)|4.2|.1.+4|55|.17 |
2013-12-23 21:02:53 | alexandrosm (GH) | |
| Glob | 17 | [unpublished] | before 2013-12-20 | andersk (RG~,GH) |
| 23 | ai|c$|^p|[bcnrw][bnopr] |
2013-12-21 18:37:50 | nwellnhof (HN) | |
[bncrw][bporn]|^p|c$|ta |
2013-12-23 16:04:15 | bbarry (GH) - some regexes in this comment were edited after the indicated date; may include this regex | ||
[bcnrw][bnopr]|^p|t[a*] |
2018-12-01 | Davidebyzero (GH,RG) | ||
[bcnrw][bnopr]|^p|en.?t |
2018-12-01 | Davidebyzero (GH,RG) | ||
[cnprw][opr]|le\w|ai|c$ |
2018-12-08 | Davidebyzero (GH,RG) | ||
[cnprw][opr]|le\w|ta|c$ |
2018-12-08 | Davidebyzero (GH,RG) | ||
[cnprw][opr]|le\w|t[a*] |
2018-12-08 | Davidebyzero (GH,RG) | ||
[cnprw][opr]|le\w|en.?t |
2018-12-08 | Davidebyzero (GH,RG) | ||
[^rt][cenprw][n-r][a-t] |
2019-12-10 08:46:41 | Davidebyzero (GH,RG) | ||
| 60 | ^(.*)\*(.*) .* \1.+\2$|^(.+) .* \3$|^.*\*(.*)\*.* .* .+\4.+$ |
2014-01-08 18:00:49 | sorcio (GH) | |
| 66 | ^(.*) .* \1$|^(.*)\*(.*) .* \2.+\3$|(.*)\*(.*)\*(.*) .* \4.+\5.+\6 |
2014-01-13 04:30:24 | sshock (GH) | |
| 54 | ^((\w*)( .+ \2$|\*(\w*)( .+ \2.+\4$|\*.* .+ \2.+\4.))) |
2014-02-13 04:55:56 | Davidebyzero (GH) | |
| 50 | ^((.*)(.+ \2$|\*(.*)( .+ \2.+\4$|\*.*.+ \2.+\4.))) |
2018-12-11 | Davidebyzero (GH) | |
| 22 | [unpublished] | 2016-11…2017-01 ≈ | Gael (RG) | |
| 22 | [unpublished] | 2019-12-06 12:27:55 | Davidebyzero (GH, RG) | |
| 21 | [unpublished] | 2018-02 ≈ | LLB (RG) | |
| Balance | 24 | [unpublished] | before 2013-12-20 | andersk (RG~,GH) |
| 34 | ^(<(<(<(<(<(<.*>)*>)*>)*>)*>)*>)*$ |
2013-12-20 15:24:00 | Overv (R) - edited 2013-12-20 15:56:16; it is unknown if the regex was longer before the edit | |
^(<(<(<(<(<(<<>>)*>)*>)*>)*>)*>)*$ |
2013-12-20 16:13:39 | nadinengland (HN) | ||
| 33 | ^(<(<(<(<(<(<.*)*>)*>)*>)*>)*>)*$ |
2013-12-20 18:39:40 | jensweh (R) | |
| 32 | ^(<(<(<(<(<>)*>|.{9})*>)*>)*>)*$ |
2014-01-02 22:55:11 | alexandrosm (GH) | |
| 31 | ^(<(<(<(<<?>?>|.{9})*>)*>)*>)*$ |
2014-01-05 14:04:09 | alexandrosm (GH) | |
| 28 | ^$|.{37}|^<(.(?!><*.>$).)*>$ |
2014-02-27 01:49:48 | Davidebyzero (GH,RG) | |
| 26 | .{37}|^(<(..(?!<.>$))*>)*$ |
2014-03-23 08:47:49 | Davidebyzero (GH,RG) | |
| 22 | [unpublished] | 2018-10-23…2018-12≈ | TH (RG) | |
| Powers | 17 | one of the 17-scoring ones below | before 2013-12-20 | andersk (RG~,GH) |
| 54 | ^((((((((((x)\10?)\9?)\8?)\7?)\6?)\5?)\4?)\3?)\2?)\1?$ |
2013-12-20 13:26:43 | Iwonderifthisistaken (R) | |
| 52 | ^xx?$|^((((((((x{4})\8?)\7?)\6?)\5?)\4?)\3?)\2?)\1?$ |
2013-12-20 15:07:07 | Hrafnahnef (R) | |
| 52 | ^((xx?)\2?|(((((((x{8})\9?)\8?)\7?)\6?)\5?)\4?)\3?)$ |
2013-12-20 15:18:10 | Bisqwit (R) | |
| 51 | ^(x|(xx){1,4}|((((((x{16})\8?)\7?)\6?)\5?)\4?)\3?)$ |
2013-12-20 15:26:55 | Bisqwit (R) | |
| 41 | ^(x|(xx){1,10}|(x{32}){1,4}|(x{32}){6,})$ |
2013-12-20 18:16:49 | Iwonderifthisistaken (R) | |
| 50 | ^(((((((((xx?)\9?)\8?)\7?)\6?)\5?)\4?)\3?)\2?)\1?$ |
2013-12-20 18:39:40 | jensweh (R) | |
| 30 | ^(((x|x{8}|x{128})\3?)\2?)\1?$ |
2013-12-20 18:43:08 | pondscum (R) | |
| 17 | ^(?!(.(..)+)\1*$) |
2013-12-20 19:18:06 | plby (GH) | |
^(?!(x(xx)+)\1*$) |
||||
^(?!((xx)+x)\1*$) |
||||
^(?!((..)+.)\1*$) |
||||
| 36 | ^(x{64})+$|^((((x?x)\5?)\4?)\3?)\2?$ |
2013-12-20 23:36:55 | q1u2acker (R) | |
| 33 | ^((x{8}){1,5}|(x{64})+|xx?|xxxx)$ |
2014-01-12 23:07:15 | sneakyruds (R) | |
| 31 | ^(((x|x{16}|x{256})\3?)\2?)\1?$ |
2014-02-12 16:09:28 | Davidebyzero (GH) | |
| 17 | ^((x+)(?=\2$))*x$ |
2014-02-21 21:30:06 | Davidebyzero (GH,RG) | |
| 17 | ^(?!(x*)(\1\1)+$) |
2019-02-05 | Grimy (GH) | |
| Long count | 14 | almost certainly the 14-scoring one below | 2014-01-07 12:27:38 | timloh (RG~) (discovery date is earlier than indicated date) |
| 15 | ((.+)0\2[1]){8} |
2014-01-15 06:28:48 | abjr (GH) | |
| 14 | ((.+)0\2+1){8} |
2014-01-15 12:04:50 | hugetoon (GH) | |
| Alphabetical | 78 | ^(?!.*(rne|eet |e.r...t|er.{6}r$))(a\S+\s)*(e\S+\s)*(r\S+\s)*([st]\S+(\s|$))*$ |
2013-12-25 05:25:31 | muxrwc (GH) |
| 46 | [^et] ren|[er]( \w+)\1|tate r|a t| ae|rt r|e e |
2013-12-25 15:31:12 | alexandrosm (GH) | |
| 45 | [^et] ren|[er]( \w+)\1|(tat|r). r|a t| ae|e e |
2013-12-25 16:26:59 | alexandrosm (GH) | |
| 41 | s ren|[er]( \w+)\1|(tat|r). r|a t| ae|e e |
2013-12-25 16:59:02 | alexandrosm (GH) | |
| 37 | r sn|( t\w+)\1|(tat|r). r|a t| ae|e e |
2013-12-25 23:45:16 | alexandrosm (GH) | |
| 36 | ( .+[ts]..)\1|(tat|r). r|a t| ae|e e |
2013-12-27 21:56:51 | bbarry (GH) | |
| 33 | ( .+[ts]..)\1|(tat|r). r|a t|e .r |
2013-12-30 00:22:58 | alexandrosm (GH) | |
| 23 | .r.{32}r|a.{10}te|n.n.. |
2013-12-31 17:04:35 | alexandrosm (GH) | |
| 23 | almost certainly the above | 2014-01-07 12:27:38 | timloh (RG~) - probably copied alexandrosm's solution | |
| 54 | ^(?!.* ((.*)t.* \2[es]|(.*)s.* \3[nr]|(.*)r.* \4[en])) |
2014-01-13 00:25:24 | dcwarwick (GH) | |
| 43 | ^(?!.*( .*)(t.*\1[es]|s.*\1[nr]|r.*\1[en])) |
2014-02-15 04:48:38 | Davidebyzero (GH) - optimization of dcwarwick's solution | |
| 22 | [unpublished] | 2018-02 ≈ | LLB (RG) | |
| Powers 2 | 19 | ^((x+)\2(?=\2$))*x$ |
2014-04-25 22:45:17 | Davidebyzero (GH,RG) |
| 22 | ^(?!((xxx)+x|xx|)\1*$) |
2014-09-18 03:05:37 | muxrwc (GH) | |
| 21 | ^(?!(x(xxx)+|xx)\1*$) |
TH (RG), Davidebyzero (GH,RG) |
| Level | Length | Regex | Domain | Date | Credit |
|---|---|---|---|---|---|
| Plain strings | 3 | foo |
^[A-Za-z][a-z]*$ |
||
| Anchors | 4 | ick$ |
^[A-Za-z][a-z]*ick[a-z]*$ |
||
| Ranges | 8 | ^[a-f]*$ |
^[a-z]+$ |
||
| Backrefs | 9 | (...).*\1 |
^[a-z]+$ |
||
| Abba | 17 | ^(?!.*(.)(.)\2\1) |
^[a-z]+$ |
||
| A man, a plan | 14 | ^(.)(.).*\2\1$ |
|||
| 40 | ^(.?)(.?)(.?)(.?)(.?)(.?).?\6\5\4\3\2\1$ |
^[a-z]+$* |
|||
| Prime | 14 | ^(?!(11+)\1+$)**** |
^11+$ |
1997-10-22 18:17:07 | Abigail (P) |
| - | ^(11+?)\1+$***** |
^11+$ |
1997-10-23 17:53:10 | John L. Allen (P) | |
| 14 | ^(?!(xx+)\1+$) |
^xx+$ |
|||
| 15 | ^(?!(xx+|)\1+$) |
^x*$*** |
2014-03-13 14:12:05 | Davidebyzero (GH) | |
| - | ^1?$|^(11+?)\1+$***** |
^1*$ |
1997-11-19 | Abigail (P) | |
| 16 | ^(?!(xx+)\1+$)xx |
^x*$ |
2014-03-13 14:50:18 | teukon (GH) | |
| 18 | ^(?=(xx+?)\1*$)\1$****** |
^x*$ |
2018-12-07 | Davidebyzero (GH) | |
| 18 | (?=(x(x*))\1+$)\2^****** |
^x*$ |
2019-04-21 | Grimy (GH) | |
| Four | 11 | (.)(.\1){3} |
^[A-Za-z][a-z]*$ |
||
| Order | 54 | ^a*b*c*d*e*f*g*h*i*j*k*l*m*n*o*p*q*r*s*t*u*v*w*x*y*z*$ |
^[a-z]+$ |
||
| Triples | 107 | ^([0369]|[258][0369]*[147]|([147]|[258][0369]*[258])([0369]|[147][0369]*[258])*([258]|[147][0369]*[147]))*$ |
^.+$ |
2013-03-27 21:49:49 | joel |
| 107 | ^([0369]|[147][0369]*[258]|([258]|[147][0369]*[147])([0369]|[258][0369]*[147])*([147]|[258][0369]*[258]))*$ |
^.+$ |
|||
| 106 | ^(?=((.*?[147]){3})*((.*?[147]|){2}))(?=((.*?[258]){3})*((.*?[258]|){2})).*$(\3\7|\4\8(?!\3|\7)|(?!\4|\8)) |
^[0-9]+$ |
2014-02-13 to 2014-02-25 | Davidebyzero & teukon (GH) (for full history, see below) | |
| Glob | 81 | ^(\*?)(\w*)(\*?)(\w*)(\*?)(\w*) .* ((?!\1).+|\1)\2((?!\3).+|\3)\4((?!\5).+|\5)\6$ |
2014-01-07 10:52:43 | DiEvAl (GH) - created before hard mode; didn't match the domain of hard mode | |
| 78 | ^(\*?)(.*)(\*?)(.*)(\*?)(.*) .* ((?!\1).+|\1)\2((?!\3).+|\3)\4((?!\5).+|\5)\6$ |
2014-01-15 20:35:11 | teukon (GH) - DiEvAl's solution modified to assume that * never occurs to the right of matches |
||
| 84 | ^(.*)(\*?)(.*)(\*?)(.*)(\*?)(.*) .* \1((?!\2).+|\2)\3((?!\4).+|\4)\5((?!\6).+|\6)\7$ |
see below | 2014-04-26 02:26:43 | Davidebyzero (GH) - DiEvAl's solution modified to assume that * never occurs to the right of matches, and to match hard mode |
|
| Balance | 37 | ^(<(<(<(<(<(<(<>)*>)*>)*>)*>)*>)*>)*$ |
^[<>]*$** |
||
| Powers | 17 | ^(?!(x(xx)+)\1*$) |
^x+$ |
||
| 17 | ^((x+)(?=\2$))*x$ |
^x*$ |
2014-02-21 21:30:06 | Davidebyzero (GH,RG) | |
| 17 | ^(?!(x*)(\1\1)+$) |
^x*$ |
2019-02-05 | Grimy (GH) | |
| Long count | 31 | ^((?=(\S*)0).{4} (?=\2[1]))+1+$ |
^([01]{4}([1 ](?!$)|$)){16}$ |
2014-02-25 | Davidebyzero (GH) |
| 35 | ^((?=(\S*)0).{4} (?=\2[1])){15}\2.$ |
^.*$ |
2014-02-25 22:33:53 | teukon (GH) | |
| Alphabetical | 76 | ^(?!.*\b((.*)n.*\b\2[e]|(.*)r.*\b\3[ne]|(.*)s.*\b\4[rne]|(.*)t.*\b\5[srne])) |
^([aenrst]{6} ?\b)+$ |
2014-01-09 06:49:57 | AlanDeSmet (GH) |
| 58 | ^(?!.*\b(.*)(e|(n|r|(s|t))).* \1(a|(?!\3)[en]|(?!\4)[rs])) |
^([aenrst]{6} ?\b)+$ |
2014-01-15 23:57:01 | teukon (GH) | |
| Powers 2 | 19 | ^((x+)\2(?=\2$))*x$ |
^x*$ |
2014-04-25 22:45:17 | Davidebyzero (GH,RG) |
| 23 | ^(?!(x(xxx)+x?|xx)\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 24 | ^(?!(x(xxx)+x?|xx|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
* A man, a plan - impossible in the general case, so this solution has a maximum robust length of 13 letters.
** Balance - impossible in the general case, so this solution has a maximum depth of 7 nesting levels.
*** If 1 is considered to be a prime number.
**** Included for historical purposes. Not technically a valid solution to this level since it works on 1s instead of xs.
***** Included for historical purposes. Not technically a valid solution to this level since it matches non-primes instead of primes and works on 1s instead of xs.
****** Of interest because of the implicit rather than explicit rejection of 0 and 1 as primes.
| Length | Regex | Domain | Date | Credit |
|---|---|---|---|---|
| 229 | ^([0369]|[258][0369]*[147]|[147]([0369]|[147][0369]*[258])*[258]|[258][0369]*[258]([0369]|[147][0369]*[258])*[258]|[147]([0369]|[147][0369]*[258])*[147][0369]*[147]|[258][0369]*[258]([0369]|[147][0369]*[258])*[147][0369]*[147])*$ |
^.+$ |
2013-03-27 20:58:04 | Alok Menghrajani |
| 107 | ^([0369]|[258][0369]*[147]|([147]|[258][0369]*[258])([0369]|[147][0369]*[258])*([258]|[147][0369]*[147]))*$ |
^.+$ |
2013-03-27 21:49:49 | joel |
^([0369]|[147][0369]*[258]|([258]|[147][0369]*[147])([0369]|[258][0369]*[147])*([147]|[258][0369]*[258]))*$ |
^.+$ |
|||
| 255 | ^((?=(([^147]*[147]){3})*[^147]*$)(?=(([^258]*[258]){3})*[^258]*$)|(?=(([^147]*[147]){3})*[^147]*[147][^147]*$)(?=(([^258]*[258]){3})*[^258]*[258][^258]*$)|(?=(([^147]*[147]){3})*([^147]*[147]){2}[^147]*$)(?=(([^258]*[258]){3})*([^258]*[258]){2}[^258]*$)) |
^[0-9]+$ |
2014-02-13 07:11:40 | Davidebyzero (GH) |
| 241 | ^((?=(([^258]*[258]){3})*[^258]*$)(([^147]*[147]){3})*[^147]*|(?=(([^258]*[258]){3})*[^258]*[258][^258]*$)(([^147]*[147]){3})*[^147]*[147][^147]*|(?=(([^258]*[258]){3})*([^258]*[258]){2}[^258]*$)(([^147]*[147]){3})*([^147]*[147]){2}[^147]*)$ |
^[0-9]+$ |
2014-02-13 07:36:23 | Davidebyzero (GH) |
| 227 | ^((?=(([^258]*[258]){3})*[^258]*$)(([^147]*[147]){3})*|(?=(([^258]*[258]){3})*[^258]*[258][^258]*$)(([^147]*[147]){3})*[^147]*[147]|(?=(([^258]*[258]){3})*([^258]*[258]){2}[^258]*$)(([^147]*[147]){3})*([^147]*[147]){2})[^147]*$ |
^[0-9]+$ |
2014-02-13 09:52:00 | Davidebyzero (GH) |
| 222 | ^((?=(((([^258]*[258]){3})*[^258]*)|((([^258]*[258]){3})*[^258]*[258][^258]*)|((([^258]*[258]){3})*([^258]*[258]){2}[^258]*)|([^258]*))$)(([^147]*[147]){3})*(\6\6\9\9|\3\3\13\13[^147]*[147](\9\9|\6\6[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 14:43:43 | Davidebyzero (GH) |
| 180 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2)|(\2[258][^258]*)|(\2([258][^258]*){2})|([^258]*))$)(([^147]*[147]){3})*(\7\7\8\8|\6\6\10\10[^147]*[147](\8\8|\7\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 14:51:01 | Davidebyzero (GH) |
^((?=((([^258]*[258]){3})*[^258]*)(.*)$)(?=((\2)|(\2[258][^258]*)|(\2([258][^258]*){2})|(\3))$)(([^147]*[147]){3})*(\8\8\9\9|\7\7\11\11[^147]*[147](\9\9|\8\8[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:08:35 | Davidebyzero (GH) | |
| 176 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2)|(\2[258][^258]*)|\2([258][^258]*){2}|([^258]*))$)(([^147]*[147]){3})*(\7\7\8\8|\6\6\9\9[^147]*[147](\8\8|\7\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:29:20 | Davidebyzero (GH) |
| 170 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2)|(\2[258][^258]*)|\2([258][^258]*){2}|([^258]*))$)(([^147]*[147]){3})*(\7\7\8\8|\6\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:36:30 | Davidebyzero (GH) |
| 169 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2)|((\2[258][^258]*)|\2([258][^258]*){2})|([^258]*))$)(([^147]*[147]){3})*(\7\7|\6\10[^147]*[147](\9\9|\8[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:47:33 | Davidebyzero (GH) |
| 168 | ^((?=((([^258]*[258]){3})*[^258]*))(?=(((\2[258][^258]*)|\2([258][^258]*){2})|((\2)|([^258]*)))$)(([^147]*[147]){3})*(\6\6|\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:52:22 | Davidebyzero (GH) |
| 164 | ^((?=((([^258]*[258]){3})*[^258]*))(?=(((\2[258][^258]*)|\2([258][^258]*){2})|(\2|[^258]*))$)(([^147]*[147]){3})*(\6\6|\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:53:11 | Davidebyzero (GH) |
| 163 | ^((?=((([^258]*[258]){3})*[^258]*))(?=(((\2[258][^258]*)|\2([258][^258]*){2})|(\2[^258]*))$)(([^147]*[147]){3})*(\6\6|\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 15:59:11 | Davidebyzero (GH) |
| 156 | ^((?=((([^258]*[258]){3})*[^258]*))(?=(((\2[258][^258]*)|\2([258][^258]*){2})|(\2))$)(([^147]*[147]){3})*(\6\6|\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 16:02:02 | Davidebyzero (GH) |
| 156 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2([258][^258]*)|\2([258][^258]*){2})|(\2))$)(([^147]*[147]){3})*(\6\6|\9[^147]*[147](\8\8|\7[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 16:09:21 | Davidebyzero (GH) |
| 158 | ^((?=((([^258]*[258]){3})*[^258]*))(?=((\2)|((\2[258][^258]*)|(\2([258][^258]*){2})))$)(([^147]*[147]){3})*(\7\7|\6[^147]*[147](\9\9|\8[^147]*[147]))[^147]*)$ |
^[0-9]+$ |
2014-02-13 16:15:43 | Davidebyzero (GH) |
| 156 | ^(?=((([^258]*[258]){3})*[^258]*))(?=((\1)|((\1[258][^258]*)|(\1([258][^258]*){2})))$)(([^147]*[147]){3})*(\6\6|\5[^147]*[147](\8\8|\7[^147]*[147]))[^147]*$ |
^[0-9]+$ |
2014-02-14 13:29:23 | Davidebyzero (GH) |
| 153 | ^(?=(([^258]*[258]){3})*[^258]*([258][^258]*([258][^258]*)?)?$)(([^147]*[147]){3})*(?=([^147]*))\7((?!\3)(?=([147][^147]*))\9((?!\4)[147][^147]*|\4)|\3)$ |
^[0-9]+$ |
2014-02-15 06:45:47 | Davidebyzero (GH) |
| 157 | ^(?=[^147]*([147]?)[^147]*([147]?)[^147]*(([147][^147]*){3})*$)[^258]*((?=.*$\1)|(?!.*$\1)[258])[^258]*((?=.*$\2)|(?!.*$\2)[258])[^258]*(([258][^258]*){3})*$ |
^[0-9]+$ |
2014-02-16 20:55:58 | teukon (GH) (discovery date is probably earlier) |
| 153 | ^(?=(([^258]*[258]){3})*[^258]*([258]?)[^258]*([258]?)[^258]*$)(([^147]*[147]){3})*(?=([^147]*))\7((?!\3)(?=([147][^147]*))\9((?!\4)[147][^147]*|\4)|\3)$ |
^[0-9]+$ |
2014-02-17 11:36:59 | Davidebyzero (GH) |
| 145 | ^(?=(([^258]*[258]){3})*[^258]*([258]?)[^258]*([258]?)[^258]*$)(([^147]*[147]){3})*(?=([^147]*))\7((?!\3)(?=(.[^147]*))\9((?!\4).[^147]*|\4)|\3)$ |
^[0-9]+$ |
2014-02-17 20:23:11 | teukon (GH) |
^(?=[^147]*([147]?)[^147]*([147]?)[^147]*(([147][^147]*){3})*$)(?=([^258]*))\5(\1|(?!\1).)(?=([^258]*))\7(\2|(?!\2).)[^258]*(([258][^258]*){3})*$ |
^[0-9]+$ |
2014-02-17 20:23:11 | teukon (GH) | |
| 137 | ^(?=(([^258]*[258]){3})*[^258]*(.?)[^258]*(.?)[^258]*$)(([^147]*[147]){3})*(?=([^147]*))\7((?!\3).|\3)(?=([^147]*))\9((?!\4).|\4)[^147]*$ |
^[0-9]+$ |
2014-02-18 08:01:51 | Davidebyzero (GH) |
^(?=[^147]*(.?)[^147]*(.?)[^147]*(([147][^147]*){3})*$)(?=([^258]*))\5(\1|(?!\1).)(?=([^258]*))\7(\2|(?!\2).)[^258]*(([258][^258]*){3})*$ |
^[0-9]+$ |
2014-02-18 08:01:51 | Davidebyzero (GH) | |
^(?=[^147]*(.?)[^147]*(.?)[^147]*(([147][^147]*){3})*$)(?=([^258]*))\5(?=(\1|.))\6(?=([^258]*))\7(?=(\2|.))\8[^258]*(([258][^258]*){3})*$ |
^[0-9]+$ |
2014-02-18 08:01:51 | Davidebyzero (GH) | |
| 127 | ^(?=(([^147]*[147]){3})*[^147]*(.?)[^147]*(.?))(?=(([^258]*[258]){3})*[^258]*(.?)[^258]*(.?))\d+$(\3\7|\4\8(?!\3|\7)|(?!\4|\8)) |
^.*$ |
2014-02-18 12:23:02 | Davidebyzero (GH) |
| 126 | ^(?=(([^147]*[147]){3})*[^147]*(.?)[^147]*(.?))(?=(([^258]*[258]){3})*[^258]*(.?)[^258]*(.?)).+$(\3\7|\4\8(?!\3|\7)|(?!\4|\8)) |
^[0-9]*$ |
2014-02-18 12:23:02 | Davidebyzero (GH) |
| 119 | ^(?=((.*?[147]){3})*[^147]*(.?)[^147]*(.?))(?=((.*?[258]){3})*[^258]*(.?)[^258]*(.?))\d+$(\3\7|(?!\3|\7)\4\8|(?!\4|\8)) |
^.*$ |
2014-02-18 18:55:50 | teukon (GH) |
| 118 | ^(?=((.*?[147]){3})*[^147]*(.?)[^147]*(.?))(?=((.*?[258]){3})*[^258]*(.?)[^258]*(.?)).*$(\3\7|(?!\3|\7)\4\8|(?!\4|\8)) |
^[0-9]*$ |
2014-02-18 18:55:50 | teukon (GH) |
| 111 | ^(?=((.*?[147]){3})*(((.*?[147])?){2}))(?=((.*?[258]){3})*(((.*?[258])?){2}))\d+$(\3\8|\4\9(?!\3|\8)|(?!\4|\9)) |
^.*$ |
||
| 110 | ^(?=((.*?[147]){3})*(((.*?[147])?){2}))(?=((.*?[258]){3})*(((.*?[258])?){2})).*$(\3\8|\4\9(?!\3|\8)|(?!\4|\9)) |
^[0-9]+$ |
2014-02-19 10:48:11 | Davidebyzero (GH) |
| 107 | ^(?=((.*?[147]){3})*((.*?[147]|){2}))(?=((.*?[258]){3})*((.*?[258]|){2}))\d+$(\3\7|\4\8(?!\3|\7)|(?!\4|\8)) |
^.*$ |
||
| 106 | (?=((.*?[147]){3})*((.*?[147]|){2}))(?=((.*?[258]){3})*((.*?[258]|){2}))^.*$(\3\7|(?!\3|\7)\4\8|(?!\4|\8)) |
^[0-9]+$ |
2014-02-25 01:50:02 | teukon (GH) |
| 106 | ^(?=((.*?[147]){3})*((.*?[147]|){2}))(?=((.*?[258]){3})*((.*?[258]|){2})).*$(\3\7|\4\8(?!\3|\7)|(?!\4|\8)) |
^[0-9]+$ |
| Base | Length | Regex | Domain | Date | Credit |
|---|---|---|---|---|---|
| 0 | 2 | ^$ |
^x*$ |
||
| 1 | 3 | ^x$ |
^x*$ |
||
| 2 | 17 | ^((x+)(?=\2$))*x$ |
^x*$ |
2014-02-21 21:30:06 | Davidebyzero (GH,RG) |
| 17 | ^(?!(.(..)+)\1*$) |
^x+$ |
2013-12-20 19:18:06 | plby (GH) | |
| 17 | ^(?!(x(xx)+)\1*$) |
^x+$ |
|||
| 18 | ^(?!(x(xx)+|)\1*$) |
^x*$ |
2014-03-13 13:21:03 | Davidebyzero (GH) | |
| 17 | ^(?!(x*)(\1\1)+$) |
^x*$ |
2019-02-05 | Grimy (GH) | |
| 3 | 19 | ^((x+)\2(?=\2$))*x$ |
^x*$ |
2014-04-25 22:45:17 | Davidebyzero (GH,RG) |
| 23 | ^(?!(x(xxx)+x?|xx)\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 24 | ^(?!(x(xxx)+x?|xx|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 25 | ^(?!((xxx)*(xx)\3?|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 31 | ^(?!(x*)(?!(\1\1)(\1\2)*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 30 | ^(?!(x*)(?!\1\1(\1{3})*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 26 | ^(?!(x*)(\1|(\1{3})+\1?)$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 4 | 21 | ^((x+)\2\2(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 5 | 22 | ^((x+)\2{3}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 33 | ^(?!(x(x{5})+x?x?x?|xxx?x?|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 33 | ^(?!(x(x{5})+x{0,3}|x{2,4}|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 31 | ^(?!(xx(x{5})*(x{4}|x?x?))\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 32 | ^(?!(xx(x{5})*(x{4}|x?x?)|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 32 | ^(?!(x*)(?!(\1{4})(\1\2)*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 31 | ^(?!(x*)(?!\1{4}(\1{5})*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 34 | ^(?!(x*)(\1?\1?(\1|(\1{5})+\1?))$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 35 | ^(?!(x*)(\1{1,3}|(\1{5})+\1{0,3})$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 6 | 22 | ^((x+)\2{4}(?=\2$))*x$ |
^x*$ |
2014-02-21 21:40:31 | teukon (GH) |
| 7 | 22 | ^((x+)\2{5}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 32 | ^(?!(x(x{7})+x{0,5}|x{2,6})\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 33 | ^(?!(x(x{7})+x{0,5}|x{2,6}|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 34 | ^(?!(xx(x{7})*(x{6}|x{0,4})|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 32 | ^(?!(x*)(?!(\1{6})(\1\2)*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 31 | ^(?!(x*)(?!\1{6}(\1{7})*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 35 | ^(?!(x*)(\1{0,4}(\1|(\1{7})+\1?))$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 35 | ^(?!(x*)(\1{1,5}|(\1{7})+\1{0,5})$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 8 | 22 | ^((x+)\2{6}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 9 | 22 | ^((x+)\2{7}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 10 | 22 | ^((x+)\2{8}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 11 | 22 | ^((x+)\2{9}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 34 | ^(?!(x(x{11})+x{0,9}|x{2,10})\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 35 | ^(?!(x(x{11})+x{0,9}|x{2,10}|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 33 | ^(?!(x*)(?!(\1{10})(\1\2)*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 33 | ^(?!(x*)(?!\1{10}(\1{11})*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 36 | ^(?!(x*)(\1{0,8}(\1|(\1{11})+\1?))$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 36 | ^(?!(x*)(\1{1,9}|(\1{11})+\1{0,9})$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 12 | 23 | ^((x+)\2{10}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 13 | 23 | ^((x+)\2{11}(?=\2$))*x$ |
^x*$ |
2018-12-05 | Davidebyzero (GH) |
| 35 | ^(?!(x(x{13})+x{0,11}|x{2,12})\1*$) |
^x+$ |
2018-12-05 | Davidebyzero (GH) | |
| 36 | ^(?!(x(x{13})+x{0,11}|x{2,12}|)\1*$) |
^x*$ |
2018-12-05 | Davidebyzero (GH) | |
| 33 | ^(?!(x*)(?!(\1{12})(\1\2)*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 33 | ^(?!(x*)(?!\1{12}(\1{13})*$)\1+$) |
^x+$ |
2019-02-08 | Davidebyzero (GH) | |
| 37 | ^(?!(x*)(\1{0,10}(\1|(\1{13})+\1?))$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) | |
| 38 | ^(?!(x*)(\1{1,11}|(\1{13})+\1{0,11})$) |
^x*$ |
2019-02-08 | Davidebyzero (GH) |
If the domain of Glob must be stated in a single regex, it would be:
^([a-z]*)\*?([a-z]*)\*?([a-z]*)\*?([a-z]*) matches \1[a-z]*\2[a-z]*\3[a-z]*\4$
However, it may actually have 4 domains:
^([a-z]*)\*([a-z]+)\*([a-z]*) matches \1[a-z]*\2[a-z]*\3$
^\*([a-z]+)\*([a-z]+)\* matches [a-z]+\1[a-z]+\2[a-z]+$ (left only)
^([a-z]+)\*([a-z]+) matches [a-z]*\1[a-z]+\2[a-z]*$ (right only)
^\*?([a-z]+)\*? matches [a-z]*\1[a-z]*$
The domains above may be controversial, as we have a limited sampling. Feel free to discuss them in this Gist.
Triples (107) DFA solution, pretty-printed:
^( [0369] | [258][0369]*[147] |
( [147] | [258][0369]*[258])
([0369] | [147][0369]*[258])*
( [258] | [147][0369]*[147]))*$
Triples (106) lookahead + backreferences solution, pretty-printed:
^(?=((.*?[147]){3})*((.*?[147]|){2}))
(?=((.*?[258]){3})*((.*?[258]|){2}))
.*$(\3\7 | \4\8(?!\3|\7) | (?!\4|\8))
Glob (84), pretty-printed:
^(.*)(\*?)
(.*)(\*?)
(.*)(\*?)(.*) .* \1((?!\2).+|\2)
\3((?!\4).+|\4)
\5((?!\6).+|\6)\7$
@Hammad1007 See the explanations in the "Solutions" dropdowns on my Regex Golf page. If you still have questions after that, I can try to answer them for you, as long as you're more specific. =)