const regex = /(?<=START)(?s)(.*?)(?=Closing)/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?<=START)(?s)(.*?)(?=Closing)', 'g')
const str = `more useless gibberish at the begininng...
separated by new lines...
START Fund Class Fund Number Fund Currency
XYZ XYZ XYZ USD
bunch of text with lots of newlines in between... Closing 11.11 1,111.11 111,111.11
more useless gibberish between the groups...
separated by new lines...
START Fund Class Fund Number Fund Currency
XYZ XYZ XYZ USD
The word START appears in the middle sometimes multiple times, but it's fine bunch of text with lots of newlines in between... Closing 22.22 2,222.22 222,222.22
more useless gibberish at the end...
separated by new lines...`;
// 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