const regex = /(?sm)(^[^\r\n]*)[\r\n](?=.*^\1)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?sm)(^[^\\r\\n]*)[\\r\\n](?=.*^\\1)', 'gm')
const str = `In 1881, Paul Gauguin joked about how to extract Cézanne's mysterious methods, instructing Camille Pissarro to "ply him with one of those mysterious homeopathic drugs and come straight to Paris
In 1881, Paul Gauguin joked about how to extract Cézanne's mysterious methods, instructing Camille Pissarro to "ply him with one of those mysterious homeopathic drugs and come straight to Paris to share the information". The painter and critic Maurice Denis shared a sense of bewilderment about Cézanne's revoluti
Cézanne's mysterious methods, instructing Camille Pissarro to "ply him with one of those mysterious homeopathic drugs and come straight to Paris to share the information".
In 1881, Paul Gauguin joked about how to extract Cézanne's mysterious methods, instructing Camille Pissarro to "ply him with one of those mysterious homeopathic drugs and come straight to Paris to share the information".
He overturned centuries of theories about how the eye works by depicting a world constantly in motion, affected by the passing of time and infused with the artist's own memories and emotions.
In 1881, Paul Gauguin joked about how to extract Cézanne's mysterious methods, instructing Camille Pissarro to "ply him with one of those mysterious homeopathic drugs and come straight to Paris to share the information".
`;
// 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