NIST

Knuth-Morris-Pratt algorithm

(algorithm)

Definition: A string matching algorithm that turns the search string into a finite state machine, then runs the machine with the string to be searched as the input string. Execution time is O(m+n), where m is the length of the search string, and n is the length of the string to be searched.

Also known as KMP.

Author: SB

Implementation

Christian Charras' and Thierry Lecroq's Exact String Matching Algorithms (C). Unix strstr implemented with KMP (C). (C and Pascal) which uses Boyer-Moore preprocessing (C)

More information

Series of pages explaining how Knuth-Morris-Pratt works.

Donald E. Knuth, James H. Morris, and Vaughan R. Pratt, Fast Pattern Matching in Strings, SIAM Journal on Computing, 6(2):323-350, 1977.


Go to the Dictionary of Algorithms and Data Structures home page.

If you have suggestions, corrections, or comments, please get in touch with Paul Black.

Entry modified 12 February 2019.
HTML page formatted Tue Feb 12 10:57:43 2019.

Cite this as:
Sterling Bates, "Knuth-Morris-Pratt algorithm", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 12 February 2019. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/knuthMorrisPratt.html