const regex = /^(((19|20)\d\d[- \/.](0[1-9]|1[012])[- \/.](0[1-9]|[12][0-9]|3[01]))|((0[1-9]|1[012])[- \/.](0[1-9]|[12][0-9]|3[01])[- \/.](19|20)\d\d)|((0[1-9]|[12][0-9]|3[01])[- \/.](0[1-9]|1[012])[- \/.](19|20)\d\d))$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(((19|20)\\d\\d[- \\\/.](0[1-9]|1[012])[- \\\/.](0[1-9]|[12][0-9]|3[01]))|((0[1-9]|1[012])[- \\\/.](0[1-9]|[12][0-9]|3[01])[- \\\/.](19|20)\\d\\d)|((0[1-9]|[12][0-9]|3[01])[- \\\/.](0[1-9]|1[012])[- \\\/.](19|20)\\d\\d))$', 'gm')
const str = `2020/02/19
19/02/2020
02/19/2020
2020 02 19
19 02 2020
02 19 2020
2020-02-19
19-02-2020
02-19-2020
`;
// 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