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FixedOrder[p1,p2,…]

is a grammar rules pattern object that represents a sequence of elements matching p1, p2, …, in the fixed order given.

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FixedOrder

FixedOrder[p1,p2,…]

is a grammar rules pattern object that represents a sequence of elements matching p1, p2, …, in the fixed order given.

Details

Examples

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Basic Examples  (2)

Deploy a grammar that requires elements to appear in a particular order:

Wolfram Language code: grammar = CloudDeploy[ GrammarRules[{FixedOrder[from : GrammarToken["City"], "to", to : GrammarToken["Ocean"]] :> from -> to}] ]

Apply the grammar:

Wolfram Language code: GrammarApply[grammar, "Boston to the Pacific"]

Extract elements of a string that appear in a particular order:

Wolfram Language code: StringCases["abc123 456def", FixedOrder[LetterCharacter.., DigitCharacter..]]

By default, elements of StringExpression are already ordered:

Wolfram Language code: StringCases["abc123 456def", LetterCharacter.. ~~ DigitCharacter..]

Applications  (1)

Deploy a simple calculator that supports infix operators, including precedence:

Wolfram Language code: calc = CloudDeploy[ GrammarRules[{GrammarToken["Addition"], GrammarToken["Multiplication"], GrammarToken["SemanticNumber"]}, { "Summand" -> s : (GrammarToken["Addition"] | GrammarToken["Multiplication"] | GrammarToken["SemanticNumber"]) :> s, "Multiplicand" -> m : (GrammarToken["Multiplication"] | GrammarToken["SemanticNumber"]) :> m, "Addition" -> FixedOrder[a : GrammarToken["Summand"], "+", b : GrammarToken["Summand"]] :> a + b, "Addition" -> FixedOrder[a : GrammarToken["Summand"], "-", b : GrammarToken["Summand"]] :> a - b, "Multiplication" -> FixedOrder[a : GrammarToken["Multiplicand"], "*", b : GrammarToken["Multiplicand"]] :> a * b, "Multiplication" -> FixedOrder[a : GrammarToken["Multiplicand"], "/", b : GrammarToken["Multiplicand"]] :> a / b }] ]

Apply the calculator grammar and actions:

Wolfram Language code: GrammarApply[calc, "2+3"]
Wolfram Language code: GrammarApply[calc, "two + three / four"]
Wolfram Language code: GrammarApply[calc, "two+one/forty-five"]
Wolfram Research (2015), FixedOrder, Wolfram Language function, https://reference.wolfram.com/language/ref/FixedOrder.html.

Text

Wolfram Research (2015), FixedOrder, Wolfram Language function, https://reference.wolfram.com/language/ref/FixedOrder.html.

CMS

Wolfram Language. 2015. "FixedOrder." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/FixedOrder.html.

APA

Wolfram Language. (2015). FixedOrder. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/FixedOrder.html

BibTeX

@misc{reference.wolfram_2026_fixedorder, author="Wolfram Research", title="{FixedOrder}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/FixedOrder.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_fixedorder, organization={Wolfram Research}, title={FixedOrder}, year={2015}, url={https://reference.wolfram.com/language/ref/FixedOrder.html}, note=[Accessed: 12-June-2026]}