const regex = /^[Pp]ython v?(?:(?:(?<epoch>[0-9]+)!)?(?<release>[0-9]+(?:\.[0-9]+)*)(?<pre>[-_\.]?(?<preLabel>(a|b|c|rc|alpha|beta|pre|preview))[-_\.]?(?<preNumber>[0-9]+)?)?(?<post>(?:-(?<postNumber0>[0-9]+))|(?:[-_\.]?(?<postLabel>post|rev|r)[-_\.]?(?<postNumber1>[0-9]+)?))?(?<dev>[-_\.]?(?<devLabel>dev)[-_\.]?(?<devNumber>[0-9]+)?)?)(?:\+(?<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))?$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^[Pp]ython v?(?:(?:(?<epoch>[0-9]+)!)?(?<release>[0-9]+(?:\\.[0-9]+)*)(?<pre>[-_\\.]?(?<preLabel>(a|b|c|rc|alpha|beta|pre|preview))[-_\\.]?(?<preNumber>[0-9]+)?)?(?<post>(?:-(?<postNumber0>[0-9]+))|(?:[-_\\.]?(?<postLabel>post|rev|r)[-_\\.]?(?<postNumber1>[0-9]+)?))?(?<dev>[-_\\.]?(?<devLabel>dev)[-_\\.]?(?<devNumber>[0-9]+)?)?)(?:\\+(?<local>[a-z0-9]+(?:[-_\\.][a-z0-9]+)*))?$', 'gm')
const str = `Python 2.7.15
python v3.6.6`;
// 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