String Pattern Matching Program

Welcome to the String Pattern Matching Program! This program is designed to help you search for specific string patterns in a text file. Follow the steps below to get started:

Instructions

Setup

Input Text File: Place the text file you want to search through in the folder.

Steps

1. Open IDE: Open your preferred C++ Integrated Development Environment (IDE) that supports C++ programming and can compile/run code.

2. Configure code.cpp: In the code.cpp file located in the folder, configure the following variables in the main function:

   • inputTextFile: Set the variable to the name of the input text file that you placed in the folder. Example: "input.txt"
   • pattern: Set the variable to the string pattern you want to search for in the text file. Example: "search_pattern"

3. Compile and Run: Compile and run the code.cpp code in your IDE. This will execute the program and search for the specified pattern in the input text file.

4. Check Results: After successful compilation and running, the program will generate an output text file named output.txt in the folder. This file will contain the search results.

5. Review Output: Open the output.txt file to see the search results. It will display information about where the specified pattern was found in the input text file.

Note: If you need to search for different patterns, make sure to clear the output.txt file before running the program again.

Example

For example, let's say you have a text file named input.txt and you want to search for the pattern "examplepattern". You would set the inputTextFile variable to "input.txt" and the pattern variable to "examplepattern". After running the program, the output.txt file will show the search results.

Searching Pattern Constraints

This program supports the following regex patterns:

• . (dot): Matches any single character except a newline.
• *: Matches zero or more occurrences of the preceding character or group.
• +: Matches one or more occurrences of the preceding character or group.
• ?: Matches zero or one occurrence of the preceding character or group.

At a time, you can use only one special regex character.

For example, cre*k is valid. c.e*k is not valid within this program, as it contains both . and * in the same pattern. """