const regex = new RegExp('(?*.{24,40}(.*))
(?=\\[size=\\d+].*?\\[/size]\\1$)
.{0,39}t.*?(?=\\1$)', 'gm')
const str = `Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed condimentum velit a felis commodo, ac efficitur nunc [size=27]Hello World[/size] dictum. Fusce auctor, [size=30]This is a test[/size] sit amet hendrerit commodo, [size=59]The quick brown fox jumps over the lazy dog[/size] enim augue consectetur nulla, vel blandit magna est vel sapien. Nam [size=42]Lorem ipsum dolor sit amet[/size] mattis ligula eu [size=41]Happiness is a warm puppy[/size] condimentum rhoncus. [size=21]Short[/size] Interdum et malesuada fames ac ante ipsum primis in faucibus. Donec interdum, [size=50]Supercalifragilisticexpialidocious[/size] ut posuere sapien venenatis vel.`;
// 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