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正規表現改善報告する回 / Regexp memoization progress report
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TSUYUSATO Kitsune
August 19, 2023
Programming
2
620
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
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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