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StringRiffle[{s1,s2,s3,…}]

creates a string by concatenating all the si, with spaces inserted between them.

StringRiffle[{{s11,s12,…},{s21,s22,…},…}]

creates a string by concatenating the sij, and inserting spaces at the lowest level and newlines at the higher level.

StringRiffle[list,sep]

inserts the separator sep between all elements in list.

StringRiffle[list,{"left","sep","right"}]

use left and right as delimiters after concatenation.

StringRiffle[list,sep1,sep2,…]

inserts separator sepi between elements of list at level i.

Details
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Examples  
Basic Examples  
Generalizations & Extensions  
Applications  
Properties & Relations  
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StringRiffle

StringRiffle[{s1,s2,s3,…}]

creates a string by concatenating all the si, with spaces inserted between them.

StringRiffle[{{s11,s12,…},{s21,s22,…},…}]

creates a string by concatenating the sij, and inserting spaces at the lowest level and newlines at the higher level.

StringRiffle[list,sep]

inserts the separator sep between all elements in list.

StringRiffle[list,{"left","sep","right"}]

use left and right as delimiters after concatenation.

StringRiffle[list,sep1,sep2,…]

inserts separator sepi between elements of list at level i.

Details

  • Any element of list that is not a string is converted to a string using TextString.
  • In StringRiffle[list], spaces are used as separators at the lowest level. At the next level up, newlines are used. At each higher level, successively more newlines are used.

Examples

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Basic Examples  (2)

Insert spaces between successive elements:

Insert a specific string between elements:

Specify delimiters to use at the beginning and end of the result:

Using newlines and spaces as separators:

Specify separators at each level:

Generalizations & Extensions  (1)

By default, higher-dimensional arrays use increasing numbers of newlines to separate levels:

Applications  (3)

Convert the contents of a matrix to a string:

Convert a table to a string in a TSV (tab-separated values) format:

Rewrite a list of key-value pairs into a JSON-like string:

Properties & Relations  (1)

Values that are not strings are converted to strings using TextString:

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

Text

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2025_stringriffle, author="Wolfram Research", title="{StringRiffle}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/StringRiffle.html}", note=[Accessed: 01-February-2026]}

BibLaTeX

@online{reference.wolfram_2025_stringriffle, organization={Wolfram Research}, title={StringRiffle}, year={2015}, url={https://reference.wolfram.com/language/ref/StringRiffle.html}, note=[Accessed: 01-February-2026]}