String Match | Computer Science
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The document defines string matching and classifies algorithms into single and multiple pattern matching. It discusses real-world applications such as security systems, DNA analysis, and password verification, alongside various algorithms like Rabin-Karp, naïve, and Knuth-Morris-Pratt (KMP). The summary highlights different matching approaches and emphasizes the importance of efficient algorithms in solving string matching problems.
String Match | Computer Science
- 1. STRING MATCH
- 2. DEFINITION AND CLASSIFICATION OF STRING MATCHING A string is given to be matched with a long text (or a string) and at this point of string matching, either a single string or multiple strings can be asked to match Based on number of strings to be matched, Pattern (nothing but a string) matching algorithms are classified as 1. Single pattern matching algorithms and 2. Multiple pattern matching algorithms
- 3. SOME REAL WORLD PROBLEMS THAT NEED STRING MATCH Finger prints and Retinal scans in high security systems like banking security DNA analysis and Bio Informatics Computer password matching Cyber Forensics department
- 4. HOW DOES A PROBLEM LOOK LIKE! TEXT: A B A C B A B C A C A B Pattern:A C B (NOT Matched initially) _ A C B (Not matched on first shift) _ _ A C B (matched on second shift) In real world, when you enter your password while you sign in your twitter account, password entered by you is matched with string in their database
- 5. DIFFERENT ALGORITHMS WITH DIFFERENT APPROACHES There are many algorithms in order to solve the problems facing in String matching. Each algorithm has its own way of matching the strings. Some match in an optimal time with minimum number of comparisons while some take very long time.
- 6. SOME WELL KNOWN ALGORITHMS Rabin-Karp String matching algorithms Naïve string matching algorithm Knuth-Morris-Pratt algorithm also better known as “KMP” Brute force comparison technique is used by Rabin-Karp and makes comparisons only if hash values in both the text and string are same.
- 7. SUMMARY • String match and its types • Some well known algorithms to do string matching • Application of string matching in real world problems • Scenario of string matching
- 8. Hey Friends, This was just a summary on String Match. For more detailed information on this topic, please type the link given below or copy it from the description of this PPT and open it in a new browser window. www.transtutors.com/homework-help/computer-science/string-match.aspx