const regex = /(?<=^|[^%])%%\w+%%(?=[^%]|$)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?<=^|[^%])%%\\w+%%(?=[^%]|$)', 'gm')
const str = `%%HELLO_WOLD%%
%HELLO_WOLD%
%%HELLO_WOLD
HELLO_WOLD%%
Test %%HELLO_WOLD%% test
Test %%HELLO_WOLD%%
%%HELLO_WOLD%% test
Test %%%HELLO_WOLD%%% test Test %%%HELLO_WOLD%%% test
Test %%%%%%%%%%%HELLO_WOLD%%%% test
Test %%%%%%%%%%%%HELLO_WOLD%%%%% test
%%%HELLO_WOLD%% test
%HELLO_WOLD% test
test %%%HELLO_WOLD%% test
test %%%HELLO_WOLD%% test
%%%HELLO_WOLD%%
`;
// 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