const regex = /(1 ){0,}(\d |\d\d )\2{1,}(1 ){0,}\2{1,}(1 ){0,}/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(1 ){0,}(\\d |\\d\\d )\\2{1,}(1 ){0,}\\2{1,}(1 ){0,}', 'gm')
const str = `3 1 1 4 4 4 4 1 4 4 5 5 1 5 5 6 7 8 1 9 9 9 9 9 9 1 3 4 5 5 1 1 5 5 6 4 4 4 1 7 1 2 2 2 2 2 2 2 1 11 11 11 11 `;
// 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