const regex = /^(?<good>\b(?:\w+\.)*(?:alsogood|good)\.com(?::\w+)?\b)(?: +\g<good>)*$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?<good>\\b(?:\\w+\\.)*(?:alsogood|good)\\.com(?::\\w+)?\\b)(?: +\\g<good>)*$', 'gm')
const str = `test.good.com:3 great.alsogood.com:latest test2.good.com
foo.bar.good.com:1
I would like it to match the previous strings but not match something like these:
test.good.com:3 another.bad.com great.good.com
foo.bad.com:1`;
// 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