const regex = /^((([a-z0-9]+[\-]{0,1})+[a-z0-9]+?\.)+[a-z0-9][a-z0-9|\-]+[a-z0-9])@([a-z0-9]+[\-|\.]{0,1}[a-z0-9]+)+(.[a-z0-9]{2,})+$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^((([a-z0-9]+[\\-]{0,1})+[a-z0-9]+?\\.)+[a-z0-9][a-z0-9|\\-]+[a-z0-9])@([a-z0-9]+[\\-|\\.]{0,1}[a-z0-9]+)+(.[a-z0-9]{2,})+$', 'gm')
const str = `m-0-o.bfe-nfk@s-ugd-og.gg-gm-ain.com.pl
wfff-ef-ff.mi-ki.fi-ki.miki@dns1-su-ddd.o-ma.in.dom-ain.kkk
max-io.be-nko@sub-dom-ain.dom-ain.com.pl
#ver. 6
^((([a-z0-9]+[\\-]{0,1})+[a-z0-9]+?\\.)+[a-z0-9][a-z0-9|\\-]+[a-z0-9])@([a-z0-9]+[\\-|\\.]{0,1}[a-z0-9])+(.[a-z0-9]{2,})+\$
#ver. 5
^([a-z0-9][a-z0-9|\\-]+[a-z0-9]{1,}?\\.)+[a-z0-9|\\-]+[a-z0-9]@([a-z0-9][a-z0-9|\\-]+?\\.[a-z0-9|\\-]+[a-z0-9](.[a-z0-9]{2,})+)\$
#ver. 4
^[\\w][a-z0-9|\\-]+?\\.[a-z0-9|\\-]+[\\w]@([\\w][a-z0-9|\\-]+?\\.[a-z0-9|\\-]+[\\w](.[a-z0-9]{2,})+)\$
# ver. 3
^[a-z0-9\\-\\.]+@([\\w][a-z0-9|\\-]+?\\.[a-z0-9|\\-]+[\\w](.[a-z0-9]{2,})+)\$
#ver. 2
^[a-z0-9\\-\\.]+@[a-z0-9|\\-]+?\\.[a-z0-9|\\-]+(.[a-z0-9]{2,})+\$
#ver. 1
^([\\w\\.\\-]+)@([\\w\\-]+)((\\.(\\w){2,3})+)\$`;
// 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