XRegExp.uninstall('namespacing');

// Change this
const name = XRegExp.exec(str, regexWithNamedCapture).name;

// To this
const name = XRegExp.exec(str, regexWithNamedCapture).groups.name;

// Using named capture and flag x for free-spacing and line comments
const date = XRegExp(
    `(?<year>  [0-9]{4} ) -?  # year
     (?<month> [0-9]{2} ) -?  # month
     (?<day>   [0-9]{2} )     # day`, 'x');

// XRegExp.exec provides named backreferences on the result's groups property
let match = XRegExp.exec('2021-02-22', date);
match.groups.year; // -> '2021'

// It also includes optional pos and sticky arguments
let pos = 3;
const result = [];
while (match = XRegExp.exec('<1><2><3>4<5>', /<(\d+)>/, pos, 'sticky')) {
    result.push(match[1]);
    pos = match.index + match[0].length;
}
// result -> ['2', '3']

// XRegExp.replace allows named backreferences in replacements
XRegExp.replace('2021-02-22', date, '$<month>/$<day>/$<year>');
// -> '02/22/2021'
XRegExp.replace('2021-02-22', date, (...args) => {
    // Named backreferences are on the last argument
    const groups = args[args.length - 1];
    return `${groups.month}/${groups.day}/${groups.year}`;
});
// -> '02/22/2021'

// XRegExps compile to RegExps and work with native methods
date.test('2021-02-22');
// -> true
// However, named captures must be referenced using numbered backreferences
// if used with native methods
'2021-02-22'.replace(date, '$2/$3/$1');
// -> '02/22/2021'

// Use XRegExp.forEach to extract every other digit from a string
const evens = [];
XRegExp.forEach('1a2345', /\d/, (match, i) => {
    if (i % 2) evens.push(+match[0]);
});
// evens -> [2, 4]

// Use XRegExp.matchChain to get numbers within <b> tags
XRegExp.matchChain('1 <b>2</b> 3 <B>4 \n 56</B>', [
    XRegExp('<b>.*?</b>', 'is'),
    /\d+/
]);
// -> ['2', '4', '56']

// You can also pass forward and return specific backreferences
const html =
    `<a href="https://xregexp.com/">XRegExp</a>
     <a href="https://www.google.com/">Google</a>`;
XRegExp.matchChain(html, [
    {regex: /<a href="([^"]+)">/i, backref: 1},
    {regex: XRegExp('(?i)^https?://(?<domain>[^/?#]+)'), backref: 'domain'}
]);
// -> ['xregexp.com', 'www.google.com']

// Merge strings and regexes, with updated backreferences
XRegExp.union(['m+a*n', /(bear)\1/, /(pig)\1/], 'i', {conjunction: 'or'});
// -> /m\+a\*n|(bear)\1|(pig)\2/i

// Test some Unicode scripts
// Can also use the Script= prefix to match ES2018: \p{Script=Hiragana}
XRegExp('^\\p{Hiragana}+$').test('ひらがな'); // -> true
XRegExp('^[\\p{Latin}\\p{Common}]+$').test('Über Café.'); // -> true

// Test the Unicode categories Letter and Mark
// Can also use the short names \p{L} and \p{M}
const unicodeWord = XRegExp.tag()`^\p{Letter}[\p{Letter}\p{Mark}]*$`;
unicodeWord.test('Русский'); // -> true
unicodeWord.test('日本語'); // -> true
unicodeWord.test('العربية'); // -> true