const regex = /(label\s\d{1,4}\sstart(\s*explanation)(.*?)up\sup\s*exit)/gs;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(label\\s\\d{1,4}\\sstart(\\s*explanation)(.*?)up\\sup\\s*exit)', 'gs')
const str = `label 123 start
int
some other random text
exit
exit
label 576 start
int
some other random text
exit
exit
label 888 start
explanation jgfjgjgj
some random text
exit
up up
exit
label 902 start
explanation jgfjgjgj
some random text
exit
up up
exit
label 456 start
explanation jgfjgjgj
some random text
exit
up up
exit`;
// 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