const regex = /([A-Z])\1{2}(?!\1)([A-Z])\2{2}(?!\1|\2)([A-Z])\3{2}(?!\1|\2|\3)([A-Z])\4{2}/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('([A-Z])\\1{2}(?!\\1)([A-Z])\\2{2}(?!\\1|\\2)([A-Z])\\3{2}(?!\\1|\\2|\\3)([A-Z])\\4{2}', 'gm')
const str = `AAABBBCCCDDD
BBBAAADDDCCC
CCCAAABBBDDD
AAABBBAAABBB
AAAAAAAAAAAA`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions