Applications of String Matching Algorithms Last Updated : 15 Jul, 2025 Comments Improve Suggest changes Like Article Like Report String matching is a process of finding a smaller string inside a larger text. For example, searching for the word "apple" in a paragraph. It is useful in areas like text search, data analysis and more. There are two types of string matching algorithms:Exact String Matching AlgorithmsApproximate String Matching AlgorithmsTo understand more about matching algorithms refer to: String Matching AlgorithmsBelow are some of the Applications of String Matching Algorithms:1. Plagiarism DetectionTo check if a document is copied, string matching is used as it break the content into smaller parts like words or sentences and compare them with other documents. If many similar parts are found the document may be marked as plagiarized. This is how tools like Turnitin or Grammarly work to find copied content.Plagiarism Detection2. Bioinformatics and DNA SequencingIn biology DNA is like a long string made up of letters A, T, G and C. String matching helps scientists to search for specific patterns in DNA. This can help in identifying diseases, mutations or matching genes in different organisms. It's like finding a tiny needle in a haystack using smart search.DNA Sequencing3. Spelling CheckerWhenever you misspell a word in your phone or computer it quickly suggests the correct spelling. This happens because a dictionary of correct words is stored in memory. A Trie or Automata structure is built from this dictionary. When you type a word it is checked letter by letter through this structure to find a correct match or highlight an error.Spelling checker4. Spam FiltersEmails that contain unwanted or suspicious content are called spam. Spam filters use string matching to check if an email contains certain keywords like “win money” or “click here.” If such words are found the email is flagged as spam.Spam Filters5. Search Engines and Large DatabasesWhen you search for something online or in an app string matching helps you find what you need. It matches the words you typed with content stored in websites or databases. This helps show you the most relevant results in just seconds.Search Engine6. Malicious Data Detection SystemTo protect computers from hackers and viruses, systems watches all the data coming in network. They use string matching to look for known dangerous patterns (like virus code). If a match is found, system raises an alarm to block the threat.Intrusion_Detection_systemString matching helps us every day from checking spelling to detecting copied content it is used everywhere. Comment More infoAdvertise with us E eshwitha_reddy Follow Improve Article Tags : DSA subsequence Hash substring Practice Tags : Hash Similar Reads Basics & PrerequisitesLogic Building ProblemsLogic building is about creating clear, step-by-step methods to solve problems using simple rules and principles. 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