Question

How to replace consecutive characters with only one using RegEx in JavaScript

Answer 1

function removeConsecutiveDuplicates(input) {
    // Matches any character (.) followed by itself one or more times (\1+)
    const pattern = /(.)\1+/g;

    // Replaces with the first captured group
    const result = input.replace(pattern, "$1");

    return result;
}

const input = "aaaabbbccdddddd";
const modified = removeConsecutiveDuplicates(input);

console.log("Original:", input);
console.log("Modified:", modified);



/*
run:

Original: aaaabbbccdddddd
Modified: abcd

*/

 

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