const regex = /(?(DEFINE)
(?<s> 0(?&b)1 | 1(?&b)0 | 1(?&c)1 | 0(?&c)0 )
(?<a> 0 | 1 )
(?<b> (?&a)(?&b)(?&a) | (?&d)1 )
(?<c> (?&a)(?&c)(?&a) | (?&d)0 )
(?<d> _(?&e) | _ )
(?<e> (?&a)(?&e) | (?&a) )
)
^(?&s)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?(DEFINE)
(?<s> 0(?&b)1 | 1(?&b)0 | 1(?&c)1 | 0(?&c)0 )
(?<a> 0 | 1 )
(?<b> (?&a)(?&b)(?&a) | (?&d)1 )
(?<c> (?&a)(?&c)(?&a) | (?&d)0 )
(?<d> _(?&e) | _ )
(?<e> (?&a)(?&e) | (?&a) )
)
^(?&s)$', 'gm')
const str = `0_00
01_101`;
// 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