Question

How to replace consecutive characters with only one using RegEx in C++

Answer 1

#include <iostream>
#include <string>
#include <regex>

int main() {
    std::string input = "aaaabbbccdddddd";
    // Matches any character (.) followed by itself one or more times (\\1+)
    std::regex pattern("(.)\\1+"); 
    
    // Replaces with the first captured group
    std::string result = std::regex_replace(input, pattern, "$1"); 

    std::cout << "Original: " << input << std::endl;
    std::cout << "Modified: " << result << std::endl;
}



/*
run:

Original: aaaabbbccdddddd
Modified: abcd

*/

 

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