const regex = /^(This is some header \d+)[\s\S]+?^(Repeated item \d+)\s*^(Repeated item.*)[\s\S]+?(Repeated item \d+)\s*^(Repeated item.*)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(This is some header \\d+)[\\s\\S]+?^(Repeated item \\d+)\\s*^(Repeated item.*)[\\s\\S]+?(Repeated item \\d+)\\s*^(Repeated item.*)', 'gm')
const str = `This is some header 1
nonsense text 1
Repeated item 1
Repeated item 1 Data
nonsense text 1
Repeated item 2
Repeated item 2 Data
This is some header 2
nonsense text 1
Repeated item 1
Repeated item 1 Data
nonsense text 1
Repeated item 2
Repeated item 2 Data`;
// 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