const regex = new RegExp('\\b(?:\\d{6} \\d{5}|[1-9]\\d{4} \\d{5}|[1-9]\\d{9}|\\d{11})\\b', 'gm')
const str = `Pattern 1 - The length of this pattern is exactly 10 and cannot start with a zero. These consist of only integers. Ex: '1234567890'
Pattern 2 - The length of this pattern is exactly 11 and can start with a zero. These consist of only integers. Ex: '01234567890'
Pattern 3 - The length of this pattern is exactly 11 and cannot start with a zero. There is one space after the 5th number and all other characters are numbers. Ex: '12345 67890'
Pattern 4 - The length of this pattern is exactly 12 and can start with a zero. There is one space after the 6th number and all other characters are numbers. Ex: '012345 67890'
Note - The example pattern example provided is for representation only. The actual set of numbers in my string can be anything. Example: '2345653340' or '034945 85730' or '000000 00000' or '09876543210'.`;
// 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