I have regex which I have tested on regex101 however when I use the same in nodejs it does not replace the newlines. The regex is /([ ]*\n)+/gm. It is supposed to replace multiple newlines with a single newline. The code is as follows. This code is a part of my vscode extension. Can someone tell me what I am doing wrong?
function format(str) {
const regex = /([ ]*\n)+/gm;
const subst = `\n`;
const result = str.replace(regex, subst);
return result;
}
function format(str) {
const regex = /([ ]*\n)+/gm;
const subst = `\n`;
const result = str.replace(regex, subst);
return result;
}
console.log(format(`abc
d
s
s`));Most probably that problem is related to CRLF line endings.
You can use
str.replace(/(?:\s*\n)+/g, '\n')
Note you do not need m flag here.
See the JavaScript demo:
const str = "abc\r\n \r\nd\r\n\r\ns\r\n\r\n\r\n\r\n\r\n \r\n\r\n \r\n\r\ns";
console.log(str.replace(/(?:\s*\n)+/g, '\n'));
const str2 = "abc\n \nd\n\ns\n\n\r\n\r\n\n \n\r\n \n\ns";
console.log(str2.replace(/(?:\s*\n)+/g, '\n'));