const regex = /(?(DEFINE)
(?<END>\n?$|\n\n)
(?<LINE>\n.+)
)
(?<=...).+(?=...(?&END))
|..(?=(?:..|.(?&LINE)|(?&LINE){2}|....(?&LINE){3,})(?&LINE)(?&END))
|(?<=\n..)..(?=.+(?&LINE)(?&END))
|(?<=\n.)..(?=.+(?&LINE){2}(?&END))
|(?<=\n)..(?=.+(?&LINE){3}(?&END))
|(?:(?<=\n....)|(?<=^....))..(?=.+(?&LINE){4,}(?&END))/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?(DEFINE)
(?<END>\\n?$|\\n\\n)
(?<LINE>\\n.+)
)
(?<=...).+(?=...(?&END))
|..(?=(?:..|.(?&LINE)|(?&LINE){2}|....(?&LINE){3,})(?&LINE)(?&END))
|(?<=\\n..)..(?=.+(?&LINE)(?&END))
|(?<=\\n.)..(?=.+(?&LINE){2}(?&END))
|(?<=\\n)..(?=.+(?&LINE){3}(?&END))
|(?:(?<=\\n....)|(?<=^....))..(?=.+(?&LINE){4,}(?&END))', 'g')
const str = `aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaa
sdaffdsdfsdsfaadd
afdsafdsfssdsfdfs
afdsfdssdfdssfdsf
asfddsfafsdfdsdsf
asfdsdfafdsafasdf
hellohellohellohellohello
hellohellohellohellohello
hellohellohellohellohello
hellohellohellohellohello
hellohellohellohellohello
hellohellohellohellohello
`;
// 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