is an option that specifies how the input should be preprocessed.
PreprocessingRules
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:
-
Automatic an automatic choice of preprocessingNone no preprocessingrules explicit set of preprocessing rules
- Rules for PreprocessingRules can involve patterns.
Examples
open all close allBasic Examples (2)
Preprocess a specific word:
Use a pattern to select and process input words:
Scope (2)
Specify a default processing rule:
Without a default rule, automatic styling is used:
Compare with all default styles:
Applications (3)
Spellcheck strings before displaying them:
Round real numbers to their closest integers:
Create a function that takes the first match in the dictionary given a word stem:
Use it to regularize the input of WordCloud :
Modify the function to only return verbs:
Properties & Relations (2)
When the preprocessing splits the word into multiple words, weights are propagated to new words:
If a word matches more than one pattern, the first match is used:
Related Guides
History
Text
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.
APA
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: 17-November-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: 17-November-2025]}