Производительность RegEx: Чередование против Trie

Question

Для подсветки синтаксиса Google Prettify для языка Wolfram Language мне нужно сопоставить все идентификаторы с большим списком из примерно 7000 имен встроенных функций, чтобы выделить их в качестве ключевых слов.В прошлом я просто использовал регулярное выражение, состоящее из много чередований .Чтобы привести конкретный пример, здесь приведены все функции, которые начинаются с Plot:

(:?Plot|Plot3D|Plot3Matrix|PlotDivision|PlotJoined|PlotLabel|PlotLabels|PlotLayout|PlotLegends|PlotMarkers|PlotPoints|PlotRange|PlotRangeClipping|PlotRangeClipPlanesStyle|PlotRangePadding|PlotRegion|PlotStyle|PlotTheme)

Теоретически это плохой выбор, поскольку для каждого альтернативного ключевого слова необходимо выполнять повторные совпадения.Что можно сделать, это построить Trie (или дерево префиксов) и построить из него регулярное выражение.Это пропустило бы все суб-совпадения, если префикс неверен.Для приведенных выше слов это выглядело бы так:

(:?Plot(?:3(?:D|Matrix)|Division|Joined|L(?:a(?:bel(?:s)?|yout)|egends)|Markers|Points|R(?:ange(?:Clip(?:PlanesStyle|ping)|Padding)?|egion)|Style|Theme)?)

Хотя это выглядит немного грязно, идея проста: он проверяет префикс Plot и, если не совпадает, дальнейшее тестирование не требуется,Если он действительно совпадает, то он переходит во внутреннее выражение и проверяет следующие префиксы, пока не найдет полное совпадение или нет.

У меня есть регулярное выражение для всех 7000 ключевых слов, совпадающих с самим собой, и 7000 словарных слов как отрицательныхпримеры с Kotlin .Реализация Trie требует 78 мс, а регулярное выражение чередования - 523 мс.Это огромное улучшение, которое я ожидал.

Однако в JavaScript реализация Trie выглядит немного медленнее.В целях профилирования я установил 2 веб-страницы, которые вызывают механизм prettify двумя различными методами. Здесь - реализация Trie, а здесь - реализация чередования.Затем я использовал Chrome dev tools для профилирования, но у меня нет особого опыта работы с JS.

Вопросы:

1. Может кто-нибудь объяснить, почему регулярное выражение Trieкажется медленнее, когда (а) само регулярное выражение меньше (хотя и сильно вложенное) и (б) регулярное выражение должно в теории делать много сочетаний клавиш при сопоставлении?
2. Учитывая два теста-сайты или даже чистое регулярное выражение здесь и здесь , может кто-нибудь сказать мне, как правильно профилировать это?Список ключевых слов и диктовых слов доступен здесь .

Answer 1

Инструмент: Строки в регулярные выражения - троичное дерево

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namedCharacters (отформатировано https://pastebin.com/HPJRGxuf)

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Options:  < none >
Completed iterations:   1  /  1     ( x 1 )
Matches found per iteration:   1013
Elapsed Time:    0.00 s,   1.42 ms,   1420 µs
Matches per sec:   713,380


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illedSquare|EmptySquare|FilledVerySmallSquare|EmptyVerySmallSquare|FilledRectangle|EmptyRectangle|FilledUpTriangle|EmptyUpTriangle|UpPointer|FilledRightTriangle|RightPointer|FilledDownTriangle|EmptyDownTriangle|DownPointer|FilledLeftTriangle|LeftPointer|FilledDiamond|EmptyDiamond|EmptyCircle|FilledCircle|EmptySmallCircle|EmptySmallSquare|FilledSmallSquare|FivePointedStar|Sun|CheckmarkedBox|CheckedBox|SadSmiley|HappySmiley|Moon|Mercury|Venus|Mars|Jupiter|Saturn|Neptune|Pluto|AriesSign|TaurusSign|GeminiSign|CancerSign|LeoSign|VirgoSign|LibraSign|ScorpioSign|SagittariusSign|CapricornSign|AquariusSign|PiscesSign|WhiteKing|WhiteQueen|WhiteRook|WhiteBishop|WhiteKnight|WhitePawn|BlackKing|BlackQueen|BlackRook|BlackBishop|BlackKnight|BlackPawn|SpadeSuit|HeartSuit|DiamondSuit|ClubSuit|QuarterNote|EighthNote|BeamedEighthNote|BeamedSixteenthNote|Flat|Natural|Sharp|Uranus|Checkmark|SixPointedStar|Perpendicular|LongLeftArrow|LongRightArrow|LongLeftRightArrow|DoubleLongLeftArrow|DoubleLongRightArrow|DoubleLongLeftRightArrow|UpArrowBar|DownArrowBar|LeftRightVector|RightUpDownVector|DownLeftRightVector|LeftUpDownVector|LeftVectorBar|RightVectorBar|RightUpVectorBar|RightDownVectorBar|DownLeftVectorBar|DownRightVectorBar|LeftUpVectorBar|LeftDownVectorBar|LeftTeeVector|RightTeeVector|RightUpTeeVector|RightDownTeeVector|DownLeftTeeVector|DownRightTeeVector|LeftUpTeeVector|LeftDownTeeVector|UpEquilibrium|ReverseUpEquilibrium|RoundImplies|LeftTriangleBar|RightTriangleBar|Equivalent|LessSlantEqual|GreaterSlantEqual|NestedLessLess|NestedGreaterGreater|PrecedesEqual|SucceedsEqual|DoubleLeftTee|LeftDoubleBracket|RightDoubleBracket|LeftAssociation|RightAssociation|Shah|WolframLanguageLogo|WolframLanguageLogoCircle|TwoWayRule|FreeformPrompt|WolframAlphaPrompt|InvisibleSpace|Piecewise|NegativeVeryThinSpace|NegativeThinSpace|NegativeMediumSpace|NegativeThickSpace|ImplicitPlus|Null|IndentingNewLine|AutoPlaceholder|AutoLeftMatch|AutoRightMatch|AutoSpace|AutoOperand|SystemsModelDelay|Continuation|RoundSpaceIndicator|InvisiblePrefixScriptBase|InvisiblePostfixScriptBase|EntityStart|EntityEnd|SpanFromLeft|SpanFromAbove|SpanFromBoth|PageBreakAbove|PageBreakBelow|DiscretionaryPageBreakAbove|DiscretionaryPageBreakBelow|Transpose|Conjugate|ConjugateTranspose|StepperRight|StepperLeft|StepperUp|StepperDown|HermitianConjugate|VerticalBar|NotVerticalBar|Distributed|Conditioned|UndirectedEdge|DirectedEdge|Gradient|Divergence|Curl|ContinuedFractionK|TensorProduct|TensorWedge|ProbabilityPr|ExpectationE|PermutationProduct|Earth|NotEqualTilde|NotHumpEqual|NotHumpDownHump|NotLeftTriangleBar|NotRightTriangleBar|NotLessLess|NotNestedLessLess|NotLessSlantEqual|NotGreaterGreater|NotNestedGreaterGreater|NotGreaterSlantEqual|NotPrecedesEqual|NotSucceedsEqual|NotSquareSubset|NotSquareSuperset|Equal|VerticalSeparator|VectorGreater|VectorGreaterEqual|VectorLess|VectorLessEqual|Limit|MaxLimit|MinLimit|Cross|Function|Xnor|DiscreteShift|DifferenceDelta|DiscreteRatio|InlinePart|RuleDelayed|Square|Rule|Implies|ShortRightArrow|ShortLeftArrow|SelectionPlaceholder|Placeholder|ShortUpArrow|ShortDownArrow|LeftBracketingBar|RightBracketingBar|LeftDoubleBracketingBar|RightDoubleBracketingBar|ScriptA|ScriptB|ScriptC|ScriptD|ScriptF|ScriptH|ScriptI|ScriptJ|ScriptK|ScriptM|ScriptN|ScriptP|ScriptQ|ScriptR|ScriptS|ScriptT|ScriptU|ScriptV|ScriptW|ScriptX|ScriptY|ScriptZ|GothicA|GothicB|GothicC|GothicD|GothicE|GothicF|GothicG|GothicH|GothicI|GothicJ|GothicK|GothicL|GothicM|GothicN|GothicO|GothicP|GothicQ|GothicR|GothicS|GothicT|GothicU|GothicV|GothicW|GothicX|GothicY|GothicZ|DoubleStruckA|DoubleStruckB|DoubleStruckC|DoubleStruckD|DoubleStruckE|DoubleStruckF|DoubleStruckG|DoubleStruckH|DoubleStruckI|DoubleStruckJ|DoubleStruckK|DoubleStruckL|DoubleStruckM|DoubleStruckN|DoubleStruckO|DoubleStruckP|DoubleStruckQ|DoubleStruckR|DoubleStruckS|DoubleStruckT|DoubleStruckU|DoubleStruckV|DoubleStruckW|DoubleStruckX|DoubleStruckY|DoubleStruckZ|DotlessJ|Wolf|FreakedSmiley|NeutralSmiley|LightBulb|NumberSign|WarningSign|Villa|Akuz|Andy|Spooky|ScriptDotlessI|ScriptDotlessJ|DoubledPi|DoubledGamma|CapitalDifferentialD|DifferentialD|ExponentialE|ImaginaryI|ImaginaryJ|FilledSmallCircle|DottedSquare|GraySquare|GrayCircle|LetterSpace|DownBreve|KernelIcon|MathematicaIcon|TripleDot|SystemEnterKey|AlignmentMarker|LeftSkeleton|RightSkeleton|ControlKey|AliasDelimiter|InvisibleComma|ReturnKey|ErrorIndicator|AliasIndicator|EscapeKey|CommandKey|LeftModified|RightModified|InvisibleApplication|DiscretionaryLineSeparator|DiscretionaryParagraphSeparator|ScriptCapitalA|ScriptCapitalC|ScriptCapitalD|ScriptCapitalG|ScriptCapitalJ|ScriptCapitalK|ScriptCapitalN|ScriptCapitalO|ScriptCapitalP|ScriptCapitalQ|ScriptCapitalS|ScriptCapitalT|ScriptCapitalU|ScriptCapitalV|ScriptCapitalW|ScriptCapitalX|ScriptCapitalY|ScriptCapitalZ|GothicCapitalA|GothicCapitalB|GothicCapitalD|GothicCapitalE|GothicCapitalF|GothicCapitalG|GothicCapitalJ|GothicCapitalK|GothicCapitalL|GothicCapitalM|GothicCapitalN|GothicCapitalO|GothicCapitalP|GothicC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Options:  < none >
Completed iterations:   1  /  1     ( x 1 )
Matches found per iteration:   1013
Elapsed Time:    0.01 s,   11.79 ms,   11787 µs
Matches per sec:   85,942