const regex = /^(?: # non-capture group (repeat)
(?| # branch reset for group 1
([^)(><\n])| # either non-bracket... or:
<(?=.*(>))| # if < open angle capture > to group 1
>(?=.*(<))| # if > capture opening < to group 1
\((?=.*(\)))| # same for (), if ( capture ) to group 1
\)(?=.*(\()) # if ) catpure ( to group 1
)(?=.*((?(2)\1\2|\1))$) # cond (2): if not outer chr (fwd ref)
)*? # as few as possible (lazy) / eof non-cap
[^)(><\n]? # the middle character (no parens)
\2$ # the right part (group 2 capture)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?: # non-capture group (repeat)
(?| # branch reset for group 1
([^)(><\\n])| # either non-bracket... or:
<(?=.*(>))| # if < open angle capture > to group 1
>(?=.*(<))| # if > capture opening < to group 1
\\((?=.*(\\)))| # same for (), if ( capture ) to group 1
\\)(?=.*(\\()) # if ) catpure ( to group 1
)(?=.*((?(2)\\1\\2|\\1))$) # cond (2): if not outer chr (fwd ref)
)*? # as few as possible (lazy) \/ eof non-cap
[^)(><\\n]? # the middle character (no parens)
\\2$ # the right part (group 2 capture)', 'gm')
const str = `(_)tar<>rat(_)
)()_<(*&bab&*)>_()(
)(*?*)(
()<_<oxxo>_>()
<__>w(owiwo)w<__>
a(t<()((<oyo>))()>t)a
v
(_)tar<>rap(_)
)()_<(*&bab&*)>_))(
)(*?*)(.
()<-<oxxo>_>()
<__>w(ow(wo)w<__>
at<()((<oyo>))()>t)a`;
// 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