const regex = /(^\d{1,2}+\.\d{1,2}\.\d{1,2}\.\d{1,2}$)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(^\\d{1,2}+\\.\\d{1,2}\\.\\d{1,2}\\.\\d{1,2}$)', 'gm')
const str = `qsdf4ghjk dfdf dfd 4fdfd3 d
4444
but not 4444
4444
333
44444.4444
2222
1
2.
3
555
6.6.7
44.5.
4.5.6.
4.5.6.7
44.44.6.4
12.12.12.12
dddd
this is a test of 3.4 and 3.4.5 and 3.4.5.6 and 33.44.55.66
hopefully something is learnded. qsdf4ghjk,
2.4.5.6.7 is here but at the beginning lets's put
2.3.5.7 but not 2.4.6.7. No space 2.4.6.7 .
3.5.6.7.
3.3.3
44
3.3.3.3
4.5.6.7.8 and more`;
// 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