Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
正規表現改善報告する回 / Regexp memoization progress report
Search
TSUYUSATO Kitsune
August 19, 2023
Programming
2
590
正規表現改善報告する回 / Regexp memoization progress report
RubyKaigi 2023 follow up(
https://rhc.connpass.com/event/288535/
) での発表資料です。
TSUYUSATO Kitsune
August 19, 2023
Tweet
Share
More Decks by TSUYUSATO Kitsune
See All by TSUYUSATO Kitsune
YAPC::Japan::Online 2022で発表して WEB+DB PRESSに記事を寄稿した話
makenowjust
0
27
Regular Expressions, REXML, Automata Learning
makenowjust
0
320
オートマトン学習しろ / Do automata learning
makenowjust
3
230
#kaigieffect LT 2024 - rexml-css_selector: A REXML extension for supporting CSS selector
makenowjust
1
350
RubyKaigi 2024 - Make Your Own Regex Engine!
makenowjust
1
1.6k
Make Regexp#match much faster
makenowjust
1
2.7k
ReDoS 検出の最先端 recheck の紹介 / State of the Art of ReDoS Detection
makenowjust
9
3.6k
ReDoS 検出プログラム recheck の開発 / recheck: ReDoS check program
makenowjust
0
160
Integrated Shrinking による 高階関数の自動生成 / PRO-2020-4 Generating Higher-Order Functions by Integrated Shrinking
makenowjust
0
150
Other Decks in Programming
See All in Programming
신입 안드로이드 개발자의 AI 스타트업 생존기 (+ Native C++ Code를 Android에서 사용해보기)
dygames
0
420
아직도 SOLID 를 '글'로만 알고 계신가요?
sh1mj1
0
310
SwiftUI移行のためのインプレッショントラッキング基盤の構築
kokihirokawa
0
230
Drawing Heighway’s Dragon- Recursive Function Rewrite- From Imperative Style in Pascal 64 To Functional Style in Scala 3
philipschwarz
PRO
0
220
❄️ NixOS/nixpkgsにSATySFiサポートを実装する
momeemt
1
120
10년 개발한 프로젝트. 애자일 업무 조직에서 모듈화 했던 경험을 공유합니다.
winterlovedev
PRO
0
540
SREチームのタスク優先度と向き合う Road to SRE NEXT@札幌
nealle
0
120
15分で学ぶDuckDBの可愛い使い方 DuckDBの最近の更新
notrogue
3
920
たのしいSocketのしくみ / Socket Under a Microscope
coe401_
9
1.5k
iOSでQRコード生成奮闘記
ktcryomm
2
180
保守性を高める AWS CDK のセオリー・ベストプラクティス
yamanashi_ren01
5
660
Learning Kotlin with detekt
inouehi
1
250
Featured
See All Featured
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
The Straight Up "How To Draw Better" Workshop
denniskardys
232
140k
Practical Orchestrator
shlominoach
186
10k
Become a Pro
speakerdeck
PRO
26
5.2k
Into the Great Unknown - MozCon
thekraken
35
1.7k
Rebuilding a faster, lazier Slack
samanthasiow
80
8.9k
A Tale of Four Properties
chriscoyier
158
23k
The Art of Programming - Codeland 2020
erikaheidi
53
13k
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
How GitHub (no longer) Works
holman
314
140k
Gamification - CAS2011
davidbonilla
80
5.2k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.5k
Transcript
౻࿘େ !NBLF@OPX@KVTU !3VCZ,BJHJGPMMPXVQ ਖ਼نදݱվળใࠂ͢Δճ
લճͷ͋Β͢͡ IUUQTSVCZLBJHJPSHQSFTFOUBUJPOTNBLFOPXKVTUIUNMEBZ
લճͷ͋Β͢͡ ਖ਼نදݱϚονϯάΛΊͬͪΌͨ͘͠
લճͷ͋Β͢͡ ͔͠͠ɺਖ਼نදݱ͕͘ͳΔͨΊʹ੍͍͔͕ͭ͘
લճͷ͋Β͢͡ ੍ϑϦʔͳੈքΛΊͯ͟͠ ό Ϧ Ξ
੍#FGPSF w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮઌಡΈɾޙಡΈʯ(?=foo) (?<=bar)ʮΞτϛοΫάϧʔϓʯ(?>foo) ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1
ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x> w ͦͷଞɺಾͷ੍ͨͪ ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ۭจࣈྻʹϚον͢Δ͔͠Εͳ͍܁Γฦ͕͠ωετͰ͖ͳ͍
w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮઌಡΈɾޙಡΈʯ(?=foo) (?<=bar)ʮΞτϛοΫάϧʔϓʯ(?>foo) ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1 ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x>
w ͦͷଞɺಾͷ੍ͨͪ ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ۭจࣈྻʹϚον͢Δ͔͠Εͳ͍܁Γฦ͕͠ωετͰ͖ͳ͍ ੍"GUFS
w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮઌಡΈɾޙಡΈʯ(?=foo) (?<=bar)ʮΞτϛοΫάϧʔϓʯ(?>foo) ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1 ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x>
w ͦͷଞɺಾͷ੍ͨͪ ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ۭจࣈྻʹϚον͢Δ͔͠Εͳ͍܁Γฦ͕͠ωετͰ͖ͳ͍ ੍"GUFS ඍົʁ
w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮઌಡΈɾޙಡΈʯ(?=foo) (?<=bar)ʮΞτϛοΫάϧʔϓʯ(?>foo) ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1 ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x>
w ͦͷଞɺಾͷ੍ͨͪ ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ۭจࣈྻʹϚον͢Δ͔͠Εͳ͍܁Γฦ͕͠ωετͰ͖ͳ͍ ੍"GUFS ཧతʹແཧ ͋·ΓΘΕͯͳ͍
w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮઌಡΈɾޙಡΈʯ(?=foo) (?<=bar)ʮΞτϛοΫάϧʔϓʯ(?>foo) ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1 ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x>
w ͦͷଞɺಾͷ੍ͨͪ ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ۭจࣈྻʹϚον͢Δ͔͠Εͳ͍܁Γฦ͕͠ωετͰ͖ͳ͍ ੍"GUFS ཧతʹແཧ ͋·ΓΘΕͯͳ͍ ͦΜͳʹ ѱ͘ͳ͍ʁ
͜Ε·ͰͷϝϞԽ w ී௨ͷਖ਼نදݱͷ߹ɺ ʮ͋Δঢ়ଶʹ͋ΔҐஔ͔ΒͷϚονͰࣦഊͨ͠ʯͱ͍͏ใΛه͢Ε0, w ϝϞԽςʔϒϧͷܕ memo: (State,
Int) -> (NoMemo | Failure) w ઌಡΈɾޙಡΈ͕͋Δ߹ɺΞτϛοΫάϧʔϓ͕͋Δ߹ʁ
ઌಡΈɾޙಡΈͷϝϞԽ w ઌಡΈɾޙಡΈ෦Ϛονϯάࣦഊ͍ͯ͠ͳͯ͘ɺ ʮ͋Δঢ়ଶɾ͋ΔҐஔʯʹ͏Ұ౸ୡ͢ΔՄೳੑ͕͋Δ ྫ/a*?(?=a*)z/ w ʮઌಡΈɾޙಡΈ෦ͷϚονϯάʹޭͨ͠ʯͱ͍͏ใΛ
ϝϞԽςʔϒϧʹه͢Δඞཁ͕͋Δ w ϝϞԽςʔϒϧͷܕ memo: (State, Int) -> (NoMemo | Success | Failure)
ΞτϛοΫά ϧʔϓͷϝϞԽ w ΞτϛοΫά ϧʔϓͷ߹ɺ ΞτϛοΫά ϧʔϓͷதͰͷࣦഊͱɺ֎ଆͰͷࣦഊΛ۠ผ͠ͳ͚Ε͍͚ͳ͍ ֎ଆͰࣦഊͨ͠߹ɺΞτϛοΫά ϧʔϓͷதͷόοΫτϥοΫ
লུ͠ͳ͚Ε͍͚ͳ͍ w ϝϞԽςʔϒϧͷܕ memo: (State, Int) -> (NoMemo | Success | AtomicFailure | Failure)
࣮ͷमਖ਼ w ࣮ࡍͷϝϞԽςʔϒϧCJUྻͳͷͰɺ ઌಡΈɾޙಡΈɾΞτϛοΫά ϧʔϓͷঢ়ଶʹରͯ͠ CJUͬͯϝϞԽ͢ΔΑ͏ʹͨ͠ w ͜Ε·Ͱʮ͋Δঢ়ଶʹ͋ΔҐஔͰ౸ୡͨ͠ʯͱ͍͏ใΛه͍͕ͯͨ͠ɺ
ʮ͋Δঢ়ଶʹ͋ΔҐஔ͔ΒͷϚονʹࣦഊͨ͠ʯͱ͍͏ใʹ͢ΔͨΊɺ όοΫτϥοΫதʹϝϞԽςʔϒϧΛߋ৽͢ΔΑ͏ʹͨ͠ IUUQTHJUIVCDPNSVCZSVCZQVMM
ݱࡏͷ੍ w ͜ΕΒͷػೳΛ͏ͱɺਖ਼نදݱϚονϯά͕࠷దԽ͞Εͳ͍ ʮ݅ذʯ(?(<x>)yes|no)ʮඇแؚԋࢉࢠʯ(?~foo) ʮޙํࢀরʯ(foo)\1 ʮ෦ࣜͷݺͼग़͠ʯ(?<x>foo)\g<x> w ͦͷଞɺಾͷ੍ͨͪ
ճࢦఆͷ܁Γฦ͕͠ωετͰ͖ͳ͍(fo{1,23}){42} ઌಡΈɾޙಡΈͱΞτϛοΫά ϧʔϓ͕ωετͰ͖ͳ͍ ઌಡΈɾޙಡΈɾΞτϛοΫά ϧʔϓͷதͰΩϟϓνϟ͑ͳ͍
ΏΔ΅ w ੍ʹ͔͔Βͳ͍͔Ͳ͏͔ΛRegexp.linear_time?ͰνΣοΫͰ͖·͢ w ͜ΕΛͬͯɺϓϩάϥϜதͷਖ਼نදݱ੍͕ʹ͔͔Βͳ͍͔νΣοΫ͢Δ 3VCPDPQϓϥάΠϯΛ࡞ͬͯɺϝϯςφϯεͯ͘͠ΕΔਓΛืू͍ͯ͠·͢ SVCZKQ4MBDLͷSFHFYQνϟϯωϧʹͯ