const regex = /\d{2}\/\d{2}\/\d{4}(?=(?:(?!\d{2}\/\d{2}\/\d{4})[^])*?error)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\d{2}\\\/\\d{2}\\\/\\d{4}(?=(?:(?!\\d{2}\\\/\\d{2}\\\/\\d{4})[^])*?error)', 'gm')
const str = `harum voluptatibus laboriosam blanditiis similique commodi labore 09/09/4567 repellat error quasi animi nostrum magnam, ab asperiores unde porro! ipsum dolor sit amet, consectetur adipisicing elit. Velit, delectus esse aperiam quod aliquid sunt iure ducimus. Nesciunt eveniet, possimus 09/09/4568 adipisci accusamus reiciendis , quos pariatur, sapiente rem quaerat cumque.
one 01/01/1111 two error 02/02/2222 three four 03/03/3333 five error`;
// 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