const regex = /^(.*?\n?.*?\.)(?:.*\(Reminder (\d*)\))?/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(.*?\\n?.*?\\.)(?:.*\\(Reminder (\\d*)\\))?', 'gm')
const str = `L-I-F-123Dolor sit amet. (Reminder 3)
L-I-F-123 Dolor sit amet.
L-I-F-123 Dolor sit amet. Lorem Ipsum.
But these break :
L-I-F-123 Dolor sit amet
L-I-F-123 Dolor sit amet. Lorem Ipsum
L-I-F-123 Dolor sit amet.(Lorem Ipsum)
L-I-F-123 Dolor sit amet.(Lorem Ipsum) (Reminder 3)`;
// 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