const regex = /(?:\G(?!\A)|{)[^{}]*?\K\([^()]*\)(?=[^{}]*})/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:\\G(?!\\A)|{)[^{}]*?\\K\\([^()]*\\)(?=[^{}]*})', 'gm')
const str = `{foo (i,j) bar} should match on (i,j)
{(i,j) foo (k,l) bar (m,n,o)} should match on (i,j), (k,l), and (m,n,o).
foo (i,j) bar should not match on anything because the string is not between swirly brackets.
{foo (i,j) bar} (k,l) should match on (i,j) but not (k,l) because the latter is outside of the swirly brackets.`;
// 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