javascript - Replace all whitespace characters - Stack Overflow

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I want to replace all occurrences of white space characters (space, tab, newline) in JavaScript.
How to do so?

I tried:

str.replace(/ /gi, "X")

I want to replace all occurrences of white space characters (space, tab, newline) in JavaScript.
How to do so?

I tried:

str.replace(/ /gi, "X")

• javascript
• trim

Share Improve this question Follow edited Aug 27, 2014 at 8:08 Stefan van den Akker 6,99977 gold badges4949 silver badges6767 bronze badges asked Jun 28, 2011 at 13:17 SouravSourav 17.5k3535 gold badges105105 silver badges161161 bronze badges 4

• 1 regular-expressions.info – Felix Kling Commented Jun 28, 2011 at 13:42
• 1 What is "X" and why? – Muhammad Shahzad Commented Mar 19, 2016 at 20:16
• What about string.replace('',"X"); – Ramesh Rajendran Commented Jan 30, 2018 at 10:27
• its just for an example @MuhammadShahzad ;) – Ali Mert Çakar Commented Apr 27, 2021 at 12:55

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10 Answers 10

Sorted by: Reset to default 371

You want \s

Matches a single white space character, including space, tab, form feed, line feed.

Equivalent to

[ \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]

in Firefox and [ \f\n\r\t\v] in IE.

---

str = str.replace(/\s/g, "X");

We can also use this if we want to change all multiple joined blank spaces with a single character:

str.replace(/\s+/g,'X');

See it in action here: https://regex101.com/r/d9d53G/1

Explanation

/ \s+ / g

• \s+ matches any whitespace character (equal to [\r\n\t\f\v ])
• + Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

• Global pattern flags
  • g modifier: global. All matches (don't return after first match)

\s is a meta character that covers all white space. You don't need to make it case-insensitive — white space doesn't have case.

str.replace(/\s/g, "X")

Have you tried the \s?

str.replace(/\s/g, "X");

If you use

str.replace(/\s/g, "");

it replaces all whitespaces. For example:

var str = "hello my world";
str.replace(/\s/g, "") //the result will be "hellomyworld"

Try this:

str.replace(/\s/g, "X")

Not /gi but /g

var fname = "My Family File.jpg"
fname = fname.replace(/ /g,"_");
console.log(fname);

gives

"My_Family_File.jpg"

You could use the function trim

let str = ' Hello World ';

alert (str.trim());

All the front and back spaces around Hello World would be removed.

Actually it has been worked but

just try this.

take the value /\s/g into a string variable like

String a = /\s/g;

str = str.replaceAll(a,"X");

I've used the "slugify" method from underscore.string and it worked like a charm:

https://github.com/epeli/underscore.string#slugifystring--string

The cool thing is that you can really just import this method, don't need to import the entire library.

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