How to replace multiple white spaces with one white space

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Let's say I have a string such as:

"Hello     how are   you           doing?"

I would like a function that turns multiple spaces into one space.

So I would get:

"Hello how are you doing?"

I know I could use regex or call

string s = "Hello     how are   you           doing?".replace("  "," ");

But I would have to call it multiple times to make sure all sequential whitespaces are replaced with only one.

Is there already a built in method for this?

string cleanedString = System.Text.RegularExpressions.Regex.Replace(dirtyString,@"\s+"," ");

Replace multiple whitespaces with single whitespace in JavaScript , replace(/(^\s+|\s+$)/g,' '); This will remove all spaces from the beginning or end of the string. If you only want to trim spaces from the end, then the regex would look like this instead: mystring = mystring. REGEX_Replace([Field], "\s+", " ") The \s+ pattern matches one or more whitespace characters, which all get replaced by a single space.

This question isn't as simple as other posters have made it out to be (and as I originally believed it to be) - because the question isn't quite precise as it needs to be.

There's a difference between "space" and "whitespace". If you only mean spaces, then you should use a regex of " {2,}". If you mean any whitespace, that's a different matter. Should all whitespace be converted to spaces? What should happen to space at the start and end?

For the benchmark below, I've assumed that you only care about spaces, and you don't want to do anything to single spaces, even at the start and end.

Note that correctness is almost always more important than performance. The fact that the Split/Join solution removes any leading/trailing whitespace (even just single spaces) is incorrect as far as your specified requirements (which may be incomplete, of course).

The benchmark uses MiniBench.

using System;
using System.Text.RegularExpressions;
using MiniBench;

internal class Program
    public static void Main(string[] args)

        int size = int.Parse(args[0]);
        int gapBetweenExtraSpaces = int.Parse(args[1]);

        char[] chars = new char[size];
        for (int i=0; i < size/2; i += 2)
            // Make sure there actually *is* something to do
            chars[i*2] = (i % gapBetweenExtraSpaces == 1) ? ' ' : 'x';
            chars[i*2 + 1] = ' ';
        // Just to make sure we don't have a \0 at the end
        // for odd sizes
        chars[chars.Length-1] = 'y';

        string bigString = new string(chars);
        // Assume that one form works :)
        string normalized = NormalizeWithSplitAndJoin(bigString);

        var suite = new TestSuite<string, string>("Normalize")
            .RunTests(bigString, normalized);

        suite.Display(ResultColumns.All, suite.FindBest());

    private static readonly Regex MultipleSpaces = 
        new Regex(@" {2,}", RegexOptions.Compiled);

    static string NormalizeWithRegex(string input)
        return MultipleSpaces.Replace(input, " ");

    // Guessing as the post doesn't specify what to use
    private static readonly char[] Whitespace =
        new char[] { ' ' };

    static string NormalizeWithSplitAndJoin(string input)
        string[] split = input.Split
            (Whitespace, StringSplitOptions.RemoveEmptyEntries);
        return string.Join(" ", split);

A few test runs:

c:\Users\Jon\Test>test 1000 50
============ Normalize ============
NormalizeWithSplitAndJoin  1159091 0:30.258 22.93
NormalizeWithRegex        26378882 0:30.025  1.00

c:\Users\Jon\Test>test 1000 5
============ Normalize ============
NormalizeWithSplitAndJoin  947540 0:30.013 1.07
NormalizeWithRegex        1003862 0:29.610 1.00

c:\Users\Jon\Test>test 1000 1001
============ Normalize ============
NormalizeWithSplitAndJoin  1156299 0:29.898 21.99
NormalizeWithRegex        23243802 0:27.335  1.00

Here the first number is the number of iterations, the second is the time taken, and the third is a scaled score with 1.0 being the best.

That shows that in at least some cases (including this one) a regular expression can outperform the Split/Join solution, sometimes by a very significant margin.

However, if you change to an "all whitespace" requirement, then Split/Join does appear to win. As is so often the case, the devil is in the detail...

How to Replace Multiple Spaces with Single Space in JavaScript, Answer: Use the JavaScript replace() method You can simply use the JavaScript replace() to replace the multiple spaces inside a string. Python – Replace multiple spaces with single space in a Text File. There are many ways to replace multiple white spaces with a single space like using a string split or regular expression module. We will see each one of them with examples. Method 1: Using Split String. Read the input text file in read mode and output file in write mode.

While the existing answers are fine, I'd like to point out one approach which doesn't work:

public static string DontUseThisToCollapseSpaces(string text)
    while (text.IndexOf("  ") != -1)
        text = text.Replace("  ", " ");
    return text;

This can loop forever. Anyone care to guess why? (I only came across this when it was asked as a newsgroup question a few years ago... someone actually ran into it as a problem.)

Simple trick to replace multiple spaces with single tab character , If you have data with multiple space characters and you wish you could replace all the multiple spaces with tab characters (I bet you want to� Use this in a formula tool: REGEX_Replace ([Field], "\s+", " ") The \s+ pattern matches one or more whitespace characters, which all get replaced by a single space.

A regular expressoin would be the easiest way. If you write the regex the correct way, you wont need multiple calls.

Change it to this:

string s = System.Text.RegularExpressions.Regex.Replace(s, @"\s{2,}", " "); 

Python – How to Replace multiple spaces with single space in Text , There are many ways to replace multiple white spaces with a single space like using a string split or regular expression module. We will see each one of them� The first one is totally pointless, \s\s+ means, an \s followed by one or more \s+, which can be reduced to a single \s+, the second example is more accurate because we only want to replace double spaces, not newlines, the third is more optimized because it only applies to examples with 2+ spaces.

As already pointed out, this is easily done by a regular expression. I'll just add that you might want to add a .trim() to that to get rid of leading/trailing whitespace.

Python Replace Multiple White Spaces with Single Space, In this tutorial, we shall learn how to replace multiple adjacent white space characters in a string with a single white space. We shall use split() and join()� If String contains only single-space then replace() will not-replace, If spaces are more than one, Then replace() action performs and removes spacess. public static String singleSpace(String str){ return str.replaceAll(" +| +|\t|\r| ",""); } To count the number of spaces in a String.

Replace multiple spaces in a string to single space with JavaScript, If you need to replace multiple spaces (double spaces) in a string to single space with JavaScript you can use next string method: replace(regexp/substr� Please notice the second example keeps single while accepted answer would replace end of line with space. If you need to replace any combination of white space characters with the first one, just remove the back-reference \k from the pattern.

How to replace multiple spaces in a string using a single space , The metacharacter “\\s” matches spaces and + indicates the occurrence of the spaces one or more times, therefore, the regular expression \\S+� Thanks. Your solution is easy to remember. The Vim wiki page on removing unwanted white space explains how to combine \s and \+ to look for many white space and tab characters. Example use to replace all spaces by one in a selection: :'<,'>s/\s\+/ /g.

Solved: Re: How to replace two or more white spaces with a , The \s+ pattern matches one or more whitespace characters, which all get replaced by a single space. Reply � 3 Likes. myString = Regex.Replace(myString, @"\s+", " "); Since it will catch runs of any kind of whitespace (e.g. tabs, newlines, etc.) and replace them with a single space. share. Share a link to this answer. Copy link.

  • Could you clarify: are you only dealing with spaces, or "all" whitespace?
  • And do you want any non-space whitespace to be converted into spaces?
  • I just meant all whitespace in series should be at most 1
  • Possible duplicate of…
  • 2 things to consider: 1. char.IsWhiteSpace includes carriage-return, linefeed etc. 2. 'whitespace' is probably more accurately tested with Char.GetUnicodeCategory(ch) = Globalization.UnicodeCategory.SpaceSeparator
  • imo, avoiding regex if your comfortable with them is premature optimization
  • If you application isn't time critical, it can afford the 1 microsecond of processing overhead.
  • Note that '\s' not only replaces white spaces, but also new line characters.
  • good catch, if you just want spaces switch the pattern to "[ ]+"
  • Shouldn't you use '{2,}' instead of '+' to avoid replacing single whitespaces?
  • Great analysis. So it appears that we were both correct to varying degrees. The code in my answer was taken from a larger function which has the ability to normalize all whitespace and/or control characters from within a string and from the beginning and end.
  • With just the whitespace characters you specified, in most of my tests the regex and Split/Join were about equal - S/J had a tiny, tiny benefit, at the cost of correctness and complexity. For those reasons, I'd normally prefer the regex. Don't get me wrong - I'm far from a regex fanboy, but I don't like writing more complex code for the sake of performance without really testing the performance first.
  • NormalizeWithSplitAndJoin will create a lot more garbage, it is hard to tell if a real problem will get hit more more GC time then the banchmark.