Boyer-Moore-Algorithm artificial intelligence

TECHNICAL SEMINAR ON
BOYER-MOORE STRING SEARCH ALGORITHM
KISHKINDA UNIVERSITY
DEPARTMENT OF COMPUTER SCIENCE &
ENGINEERING
Presented By : P Sahana Prasad
(KUB24MCS015)
HOD [M.Tech(CSE)]
Dr. Rajashree V Biradar
Guided by :
MR. G VannurSwamy

Introduction to Boyer-Moore
Algorithm
•The Boyer-Moore algorithm is
an efficient string-searching
algorithm that finds a pattern
within a text. It uses
preprocessing techniques to
skip sections of text, making it
faster than simpler algorithms.

Steps of the Algorithm
• 1. **Preprocessing the Pattern:**
• - Create two heuristic arrays:
• - **Bad-character shift:** Determines the shift for
mismatches.
• - **Good-suffix shift:** Optimizes shifts for partial
matches.
• 2. **Pattern Matching:**
• - Start matching from the rightmost end of the pattern.
• - On mismatch, use the heuristics to decide how much to
shift the pattern.

Bad-Character Rule
• For each character in the pattern, calculate how much to
shift if a mismatch occurs:
• - For pattern **P = 'ABC'**:
• - 'A' Shift by 1 (position 0)
→
• - 'B' Shift by 2 (position 1)
→
• - 'C' Shift by 3 (position 2)
→
• This helps skip unnecessary comparisons and speeds up
the search.

Example Walkthrough
• **Text (T): ABAAABCD**
• **Pattern (P): ABC**
• 1. Start matching from the rightmost character of the
pattern.
• 2. On mismatch, use the bad-character rule to shift the
pattern.
• 3. Repeat until the pattern is found or the text ends.

Summary
• - The Boyer-Moore algorithm is one of the fastest string-
searching algorithms.
• - It uses two heuristics (bad-character and good-suffix) to
skip sections of text.
• - Ideal for large texts with longer patterns.
• **Efficient, powerful, and widely used in real-world
applications!**

Boyer-Moore-Algorithm artificial intelligence

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