re-samples.js: JavaScript Regex examples

re-samples.js

let personList = `First_Name: John, Last_Name: Doe
First_Name: Jane, Last_Name: Smith`;

// Adding a ? at the end of the named capturing group makes it optional, e.g. '... (?<lastname>\w+)?'
let regexpNames =  /First_Name: (?<firstname>\w+), Last_Name: (?<lastname>\w+)/mg;
let match = regexpNames.exec(personList);
do {
  console.log(`Hello ${match.groups.firstname} ${match.groups.lastname}`);
} while((match = regexpNames.exec(personList)) !== null);


const found = "team-1234-private".match(/^((?<context>team|user)-)?(?<ctxId>\d+)((?<isPrivate>)-private)?$/);
if (found) {
  const { context, ctxId, isPrivate } = found.groups;
  // ...
}