如何在 javascript 中用空格替换换行符/换行符？

Question

I have a var that contains a big list of words (millions) in this format:

 var words = " car house home computer go went ";

I want to make a function that will replace the newline between each word with space.

So the results would something look like this:

 car house home computer go went

Answer 1

You can use the .replace() function:

 words = words.replace(/\n/g, " ");

Note that you need the g flag on the regular expression to get replace to replace all the newlines with a space rather than just the first one.

Also, note that you have to assign the result of the .replace() to a variable because it returns a new string. It does not modify the existing string. Strings in Javascript are immutable (they aren't directly modified) so any modification operation on a string like .slice() , .concat() , .replace() , etc... returns a new string.

 let words = "a\nb\nc\nd\ne"; console.log("Before:"); console.log(words); words = words.replace(/\n/g, " "); console.log("After:"); console.log(words);

Answer 2

In case there are multiple line breaks (newline symbols) and if there can be both \r or \n, and you need to replace all subsequent linebreaks with one space, use

var new_words = words.replace(/[\r\n]+/g," ");

See regex demo

To match all Unicode line break characters and replace/remove them, add \x0B\x0C\u0085\u2028\u2029 to the above regex:

/[\r\n\x0B\x0C\u0085\u2028\u2029]+/g

The /[\r\n\x0B\x0C\u0085\u2028\u2029]+/g means:

• [ - start of a positive character class matching any single char defined inside it:
  • \r - (\x0D) - \n] - a carriage return (CR)
  • \n - (\x0A) - a line feed character (LF)
  • \x0B - a line tabulation (LT)
  • \x0C - form feed (FF)
  • \u0085 - next line (NEL)
  • \u2028 - line separator (LS)
  • \u2029 - paragraph separator (PS)
• ] - end of the character class
• + - a quantifier that makes the regex engine match the previous atom (the character class here) one or more times (consecutive linebreaks are matched)
• /g - find and replace all occurrences in the provided string.

var words = "car\r\n\r\nhouse\nhome\rcomputer\ngo\n\nwent";
document.body.innerHTML = "<pre>OLD:\n" + words + "</pre>";
var new_words = words.replace(/[\r\n\x0B\x0C\u0085\u2028\u2029]+/g," ");
document.body.innerHTML += "<pre>NEW:\n" + new_words + "</pre>";

Answer 3

Code: (FIXED)

 var new_words = words.replace(/\n/g," ");

Answer 4

Some simple solution would look like

words.replace(/(\n)/g," ");

Answer 5

No need for global regex, use replaceAll instead of replace

 myString.replaceAll('\n', ' ')