const regex = /\b
(?=
(?<result>
(?<consume>
(?> \w+ \h+ ){0,3}?
keyword \b
)
(?: \h+ (?! keyword \b ) \w+ ){0,3}
)
) \g{consume}
/ug;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\b
(?=
(?<result>
(?<consume>
(?> \\w+ \\h+ ){0,3}?
keyword \\b
)
(?: \\h+ (?! keyword \\b ) \\w+ ){0,3}
)
) \\g{consume}
', 'ug')
const str = `word1 word2 word3 keyword word4 word5 word6 keyword word7 word8 word9 word10
word2 keyword word4 word5 word6 keyword word7 word8
word2 word3 keyword word4 word5 word6 keyword word7 keyword word10`;
// 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