const regex = /\{((?:[^{}]|(?R))+)\}/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\{((?:[^{}]|(?R))+)\\}', 'gm')
const str = `Eu sou uma string {dentro de uma string {dentro de outra} }
String {com {vários {níveis {de } chaves}} aninhadas}.
String {com mais {de} um} trecho {com {chaves}}
String com {chaves {desbalanceadas}
Chaves {} vazias
Apenas {um par de} chaves
Somente abre { chaves.`;
// 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