StringReplacePart

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StringReplacePart["string","snew",{m,n}]

replaces the characters at positions m through n in "string" by "snew".

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StringReplacePart["string","snew",{{m₁,n₁},{m₂,n₂},…}]

inserts copies of "snew" at several positions.

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StringReplacePart["string",{"snew₁","snew₂",…},{{m₁,n₁},{m₂,n₂},…}]

replaces characters at positions m_i through n_i in "string" by "snew_i".

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StringReplacePart["snew",{m,n}]

represents an operator form of StringReplacePart that can be applied to an expression.

Details

StringReplacePart uses position specifications in the form returned by StringPosition. »
When a list of "snew_i" is given, its length must be the same as the length of the list of positions. »
When multiple positions are given, all refer to the original "string", before any replacements have been done.
StringReplacePart[s,"",…] can be used to delete substrings. »
StringReplacePart[new,part][old] is equivalent to StringReplacePart[old,new,part].
StringReplacePart[BioSequence["type","seq"],"snew",part] will apply the operation to the string "seq", yielding a BioSequence result.
Given a circular BioSequence and a starting position greater than the ending position, i.e. m>n, then StringReplacePart[bioseq,"snew",{m,n}] replaces the wrapped-around sequence starting at m and ending at n.

Examples

open allclose all

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

Replace characters 2 through 5 with a new string:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-mm6

Out[1]=1

Replace several sequences of characters with a new string:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-f6s

Out[1]=1

Use the operator form of StringReplacePart:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-bb46a1

Out[1]=1

Scope (5)Survey of the scope of standard use cases

Negative positions count from the end:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-tgr

Out[1]=1

Replace two sequences of characters with two new strings:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-v9t

Out[1]=1

Use the operator form to replace two sequences of characters with two new strings:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-544tfc

Out[1]=1

Replace a codon in a DNA sequence:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-gz46r7

Out[1]=1

Undertake a wrap-around replace on a biomolecular sequence:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-3as1mp

Out[1]=1

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

Simulating a multiway system [more info]:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-vige4x

In[2]:=2

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https://wolfram.com/xid/0n4feczxhgy-iz5o5k

In[3]:=3

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https://wolfram.com/xid/0n4feczxhgy-7xzvrt

The evolution of a multiway system:

In[4]:=4

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https://wolfram.com/xid/0n4feczxhgy-kwf087

Out[4]=4

Properties & Relations (3)Properties of the function, and connections to other functions

StringReplacePart can use the output from StringPosition:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-gzpb5h

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0n4feczxhgy-j4fehh

Out[2]=2

This is equivalent to StringReplace:

In[3]:=3

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https://wolfram.com/xid/0n4feczxhgy-dz31k3

Out[3]=3

Replacing with an empty string is equivalent to StringDrop:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-zip

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0n4feczxhgy-nzk

Out[2]=2

StringReplacePart can drop several sequences of characters at a time:

In[3]:=3

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https://wolfram.com/xid/0n4feczxhgy-u8b

Out[3]=3

Use position {n,n-1} to insert at position n, without overwriting anything:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-ha2

Out[1]=1

StringInsert can do the same:

In[2]:=2

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https://wolfram.com/xid/0n4feczxhgy-mm0

Out[2]=2

Possible Issues (1)Common pitfalls and unexpected behavior

The position specifications are not allowed to overlap:

In[1]:=1

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https://wolfram.com/xid/0n4feczxhgy-hf17a

Out[1]=1

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