删除 \n 和 \r 但不删除 \r\n

Question

I have a string with both \r and \n as well as \r\n .

How do we remove \r and \n , while keeping \r\n in tact?

Answer 1

Negative lookahead+lookbehind can do that:

 const test="a\nb\rc\r\nd\n\re"; console.log(test.replaceAll(/(\r(??\n)|((,<;\r)\n))/g,"x")); // ^^^^^^^^ match \r if it has no \n after // ^^^^^^^^^^^ match \n if it has no \r before

Only the \r\n between c and d are kept intact.