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PreprocessingRules
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PreprocessingRules

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is an option that specifies how the input should be preprocessed.

Details

  • The rules given by PreprocessingRules are applied to each expression.
  • Typical settings are:
  • Automatican automatic choice of preprocessing
    Noneno preprocessing
    rulesexplicit set of preprocessing rules
  • Rules for PreprocessingRules can involve patterns.

Examples

open allclose all

Basic Examples  (2)Summary of the most common use cases

Preprocess a specific word:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-x4aqq8
Out[1]=1

Use a pattern to select and process input words:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-ozaej9
Out[1]=1

Scope  (2)Survey of the scope of standard use cases

Specify a default processing rule:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-0agdhj
Out[1]=1

Without a default rule, automatic styling is used:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-o03217
Out[1]=1

Compare with all default styles:

In[2]:=2
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https://wolfram.com/xid/0bc597oamu2lboy-voxt1t
Out[2]=2

Applications  (3)Sample problems that can be solved with this function

Spellcheck strings before displaying them:

In[2]:=2
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https://wolfram.com/xid/0bc597oamu2lboy-ydhc96
Out[2]=2

Round real numbers to their closest integers:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-8im5gi
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc597oamu2lboy-5u8khr
Out[2]=2

Create a function that takes the first match in the dictionary given a word stem:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-synit4
In[2]:=2
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https://wolfram.com/xid/0bc597oamu2lboy-q1m3mm

Use it to regularize the input of WordCloud:

In[3]:=3
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https://wolfram.com/xid/0bc597oamu2lboy-knzr9t
Out[3]=3

Modify the function to only return verbs:

In[4]:=4
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https://wolfram.com/xid/0bc597oamu2lboy-r9fz87
In[5]:=5
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https://wolfram.com/xid/0bc597oamu2lboy-dnse3w
Out[5]=5

Properties & Relations  (2)Properties of the function, and connections to other functions

When the preprocessing splits the word into multiple words, weights are propagated to new words:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-y8prlr
In[3]:=3
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https://wolfram.com/xid/0bc597oamu2lboy-itkjta
Out[3]=3
In[4]:=4
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https://wolfram.com/xid/0bc597oamu2lboy-1rmwux
Out[4]=4

If a word matches more than one pattern, the first match is used:

In[1]:=1
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https://wolfram.com/xid/0bc597oamu2lboy-dyv85k
Out[1]=1
Wolfram Research (2017), PreprocessingRules, Wolfram Language function, https://reference.wolfram.com/language/ref/PreprocessingRules.html.
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Wolfram Research (2017), PreprocessingRules, Wolfram Language function, https://reference.wolfram.com/language/ref/PreprocessingRules.html.

Text

Wolfram Research (2017), PreprocessingRules, Wolfram Language function, https://reference.wolfram.com/language/ref/PreprocessingRules.html.

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Wolfram Research (2017), PreprocessingRules, Wolfram Language function, https://reference.wolfram.com/language/ref/PreprocessingRules.html.

CMS

Wolfram Language. 2017. "PreprocessingRules." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/PreprocessingRules.html.

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Wolfram Language. 2017. "PreprocessingRules." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/PreprocessingRules.html.

APA

Wolfram Language. (2017). PreprocessingRules. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/PreprocessingRules.html

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Wolfram Language. (2017). PreprocessingRules. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/PreprocessingRules.html

BibTeX

@misc{reference.wolfram_2025_preprocessingrules, author="Wolfram Research", title="{PreprocessingRules}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/PreprocessingRules.html}", note=[Accessed: 08-July-2025 ]}

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@misc{reference.wolfram_2025_preprocessingrules, author="Wolfram Research", title="{PreprocessingRules}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/PreprocessingRules.html}", note=[Accessed: 08-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_preprocessingrules, organization={Wolfram Research}, title={PreprocessingRules}, year={2017}, url={https://reference.wolfram.com/language/ref/PreprocessingRules.html}, note=[Accessed: 08-July-2025 ]}

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@online{reference.wolfram_2025_preprocessingrules, organization={Wolfram Research}, title={PreprocessingRules}, year={2017}, url={https://reference.wolfram.com/language/ref/PreprocessingRules.html}, note=[Accessed: 08-July-2025 ]}