const regex = new RegExp('\\[(run)] ( (?: (?: (?!\\[/?\\1]) . )* | (?R) )* ) \\[/\\1]', 'gs')
const str = `[run][one]This[/one][two]That[/two][/run]
[run][one]This 2[/one][two]That 2[/two][/run]
[run][one]IF THIS RESULT DO THIS [run][one]This[/one][two]That[/two][/run][/one][two]IF THIS RESULT DO THAT [run][one]This[/one][two]That[/two][/run][/two][/run]
[run][one]IF THIS RESULT DO THIS
[run][one]This[/one][two]That[/two][/run]
[/one][two]IF THIS RESULT DO THAT [run][one]This[/one][two]That[/two][/run][/two][/run]`;
// 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