
- LISP Tutorial
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- Lisp Functions
- LISP - Functions
- LISP - Functions vs Macros
- LISP - Calling Function using funcall
- LISP - Calling Function using apply
- LISP - Closures
- LISP - Functions as Arguments
- LISP - Functions as Return Values
- LISP - Recursion
- LISP - Built-in Functions
- Lisp Predicates
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- LISP - Equality Predicates
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- Lisp Arrays
- LISP - Arrays
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- LISP - Arrays Properties
- LISP - Iterating over Arrays
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- Lisp Strings
- LISP - Strings
- LISP - String Concatenation
- LISP - String Comparison
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- LISP - String Trimmimg
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- LISP - Getting Substring
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- LISP - Sorting Strings
- LISP - Merging Strings
- LISP - Accessing Characters of String
- LISP - String length
- LISP - Escape Sequences
- Lisp Sequences
- LISP - Sequences
- LISP - Accessing Element of Sequence
- LISP - Sequence length
- LISP - Getting Subsequence
- LISP - Search Element in Sequence
- LISP - Sequence Concatenation
- LISP - Reversing a Sequence
- LISP - Mapping Sequence Element
- LISP - position of Element
- LISP - Remove an Element
- LISP - Sort Sequence
- LISP - Merge Sequences
- LISP - every function
- LISP - some function
- LISP - notany function
- LISP - notevery function
- Lisp Lists
- LISP - Lists
- LISP - Accessing Elements of Lists
- LISP - Modifications to Lists
- LISP - Using mapcar on List
- LISP - Using mapc on List
- LISP - Using reduce on List
- LISP - Removing elements from List
- LISP - Reversing a List
- LISP - Sorting a List
- LISP - Searching a List
- LISP - List vs Vectors
- LISP - Matrix Multiplication
- Lisp Vectors
- LISP - Vectors
- LISP - Creating Vectors
- LISP - Accessing Elements of Vectors
- LISP - Modifications to Vectors
- LISP - Adjustable Vectors
- LISP - Specialized Vectors
- LISP - Vector Functions
- Lisp Set
- LISP - Set
- LISP - Adding elements to the Set
- LISP - Getting SubSet from a Set
- LISP - Set Difference
- LISP - Set Exclusive OR
- LISP - Set Intersection
- LISP - Set Union
- LISP - Representing Set with HashTable
- LISP - List as Set vs HashTable as Set
- Lisp Tree
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- LISP - Recursive Traversal
- LISP - Inorder Traversal
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- LISP - Depth First Traversal
- LISP - Modifying Tree
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- Lisp Hash Table
- LISP - Hash Table
- Adding Values to Hash Table
- Removing Values from Hash Table
- Updating Values of Hash Table
- Iterating Hash Table Entries
- Searching key in HashTable
- Checking Size of HashTable
- Using Custom Equality Check
- Lisp - Input − Output
- LISP - Input − Output
- LISP - Streams
- LISP - Reading Data from Streams
- LISP - Writing Data to Streams
- LISP - File I/O
- LISP - String I/O
- LISP - Formatting with Format
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- Lisp - Structures
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- LISP - Structure Options
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- LISP - Applications and Best Practices
- Lisp - CLOS
- LISP - CLOS
- Lisp - Objects
- LISP - Class
- LISP - Slots and Accessors
- LISP - Generic Functions
- LISP - Class Precedence
- LISP - Metaobject Protocol
- LISP - Multimethods
- LISP - Multiple Inheritance
- LISP - Method Combinations
- LISP - Method Combinations
- LISP - :before Method Combination
- LISP - :primary Method Combination
- LISP - :after Method Combination
- LISP - :around Method Combination
- LISP - + Method Combination
- LISP - and Method Combination
- LISP - append Method Combination
- LISP Useful Resources
- Lisp - Quick Guide
- Lisp - Useful Resources
- Lisp - Discussion
Lisp - String Substring
Lisp provides subseq() method to get a substring from string.
Using subseq() method
The subseq function returns a sub-string (as a string is also a sequence) starting at a particular index and continuing to a particular ending index or the end of the string.
It is very useful method to extract a part of string as shown below.
Example - Substring till end of the string
Following code shows how to get a substring starting from a given index till the end of the string.
Create source code file named main.lisp and type the following code in it.
main.lisp
; print substring of statement starting from index 6 (write-line (subseq "Hello World" 6))
Output
When you execute the code, it returns the following result −
World
Example - Substring from start index till end index
Following code shows how to get a substring starting from a given index till a given end index.
main.lisp
; print substring of statement starting from index 10 to 25 (write-line (subseq "Welcome to Tutorialspoint World" 10 25 ))
Output
When you execute the code, it returns the following result −
Tutorialspoint
Example - Invalid Start Index
As string is an array of characters, subseq uses aref function to get the relevant indexes. If start index is invalid, LISP interpreter will complain as shown in code below:
main.lisp
; Error as start index is invalid (write-line (subseq "Welcome to Tutorialspoint World" 40 ))
Output
When you execute the code, it returns the following result −
*** - SUBSEQ: :START =40 should not be greater than :END = 31
Example - Invalid End Index
As string is an array of characters, subseq uses aref function to get the relevant indexes. If end index is invalid, LISP interpreter will complain as shown in code below:
main.lisp
; Error as end index is invalid (write-line (subseq "Welcome to Tutorialspoint World" 20 50))
Output
When you execute the code, it returns the following result −
*** - AREF: index 31 for "Welcome to Tutorialspoint World" is out of range