WOLFRAM

Wolfram Language & System Documentation Center
Wolfram Language Home Page »

SequenceSplit
✖
SequenceSplit

✖
SequenceSplit[list,patt]

splits list into sublists separated by sequences that match the sequence pattern patt.

✖
SequenceSplit[list,pattrhs]

inserts rhs at the position of each matched sequence.

✖
SequenceSplit[list,{patt1rhs1,…}]

inserts rhsi at the position of each patti.

✖
SequenceSplit[list,patt,n]

splits into at most n sublists.

Details

  • SequenceSplit[list,patt] by default gives the list of sublists of list that occur between sequences defined by patt; it does not include the sequences themselves.
  • SequenceSplit[list,{patt1rhs1,…,patta,…}] includes rhsi at the position of sequences matching patt1 but omits sequences matching patta.

Examples

open allclose all

Basic Examples  (3)Summary of the most common use cases

Split at sequences that match a pattern:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-mdfdlq
Out[1]=1

Insert an expression at the position of the matched sequences:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-dsgafj
Out[1]=1

Split into at most 2 sublists:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-e43wf4
Out[1]=1

Scope  (6)Survey of the scope of standard use cases

Use a pattern to split the original list:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-b37kmv
Out[1]=1

Use a rule to replace the matched sequences:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-epwwcl
Out[1]=1

Split the original list at sequences that match any of the patterns:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-jalbpq
Out[1]=1

Use a list of rules to replace the matched sequences:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-l0cdj1
Out[1]=1

Use rules and patterns:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-ejkm65
Out[1]=1

Split into at most 2 sublists:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-fty117
Out[1]=1

Applications  (1)Sample problems that can be solved with this function

Find the most frequent length for a run of consecutive non-prime numbers:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-fthe61
Out[1]=1

Properties & Relations  (8)Properties of the function, and connections to other functions

Insert a list of elements at the position of the matched sequence:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-c5xb3k
Out[1]=1

Use Sequence instead of List to splice the elements in the output list:

In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-f3zsp3
Out[2]=2

Rules are tried in the given order:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-gy3hy
In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-cyivzp
Out[2]=2
In[3]:=3
✖
https://wolfram.com/xid/09a74swvo-oyw7if
Out[3]=3

A list of sublists is considered as a single sequence pattern:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-dknyik
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-dbi4k
Out[2]=2

Use Alternatives to split at any of the sequence subpatterns:

In[3]:=3
✖
https://wolfram.com/xid/09a74swvo-kxlowg
Out[3]=3

The third argument of SequenceSplit is the count of sublists not considering insertions:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-bcywg
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-d5dbu
Out[2]=2
In[3]:=3
✖
https://wolfram.com/xid/09a74swvo-fu432n
Out[3]=3

Split a list into sublists delimited by sequences that match a pattern:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-llva45
Out[1]=1

Replace a sequence by an expression:

In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-gmylfy
Out[2]=2

Find the position of the sequence:

In[3]:=3
✖
https://wolfram.com/xid/09a74swvo-juwed5
Out[3]=3

Find the actual sequence:

In[4]:=4
✖
https://wolfram.com/xid/09a74swvo-e6a7zh
Out[4]=4

Count the number of cases:

In[5]:=5
✖
https://wolfram.com/xid/09a74swvo-c121qh
Out[5]=5

Split at any sequence of integers:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-ddsfo9
Out[1]=1

Use SequenceCases instead:

In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-eorbg7
Out[2]=2

For lists of characters, SequenceSplit is similar to StringSplit:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-h38kyo
In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-brl07j
Out[2]=2
In[3]:=3
✖
https://wolfram.com/xid/09a74swvo-kqok0u
Out[3]=3

Split by parity:

In[1]:=1
✖
https://wolfram.com/xid/09a74swvo-eieecn
Out[1]=1

Compare with SplitBy:

In[2]:=2
✖
https://wolfram.com/xid/09a74swvo-gt0elr
Out[2]=2
Wolfram Research (2018), SequenceSplit, Wolfram Language function, https://reference.wolfram.com/language/ref/SequenceSplit.html.
✖
Wolfram Research (2018), SequenceSplit, Wolfram Language function, https://reference.wolfram.com/language/ref/SequenceSplit.html.

Text

Wolfram Research (2018), SequenceSplit, Wolfram Language function, https://reference.wolfram.com/language/ref/SequenceSplit.html.

✖
Wolfram Research (2018), SequenceSplit, Wolfram Language function, https://reference.wolfram.com/language/ref/SequenceSplit.html.

CMS

Wolfram Language. 2018. "SequenceSplit." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/SequenceSplit.html.

✖
Wolfram Language. 2018. "SequenceSplit." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/SequenceSplit.html.

APA

Wolfram Language. (2018). SequenceSplit. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/SequenceSplit.html

✖
Wolfram Language. (2018). SequenceSplit. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/SequenceSplit.html

BibTeX

@misc{reference.wolfram_2025_sequencesplit, author="Wolfram Research", title="{SequenceSplit}", year="2018", howpublished="\url{https://reference.wolfram.com/language/ref/SequenceSplit.html}", note=[Accessed: 29-March-2025 ]}

✖
@misc{reference.wolfram_2025_sequencesplit, author="Wolfram Research", title="{SequenceSplit}", year="2018", howpublished="\url{https://reference.wolfram.com/language/ref/SequenceSplit.html}", note=[Accessed: 29-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_sequencesplit, organization={Wolfram Research}, title={SequenceSplit}, year={2018}, url={https://reference.wolfram.com/language/ref/SequenceSplit.html}, note=[Accessed: 29-March-2025 ]}

✖
@online{reference.wolfram_2025_sequencesplit, organization={Wolfram Research}, title={SequenceSplit}, year={2018}, url={https://reference.wolfram.com/language/ref/SequenceSplit.html}, note=[Accessed: 29-March-2025 ]}