const regex = /\A
(?<major>0|[1-9]\d*)\.
(?<minor>0|[1-9]\d*)\.
(?<patch>0|[1-9]\d*)
(?:
-(?<prerelease>
(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)
(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*
)
)?
(?:
\+(?<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*)
)?
\Z
/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\A
(?<major>0|[1-9]\\d*)\\.
(?<minor>0|[1-9]\\d*)\\.
(?<patch>0|[1-9]\\d*)
(?:
-(?<prerelease>
(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)
(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*
)
)?
(?:
\\+(?<buildmetadata>[0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*)
)?
\\Z
', 'gm')
const str = `1.0.0`;
// 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