This question already has answers here: How do I replace all occurrences of a string in JavaScript? (78 answers) Closed 7 years ago.

I have a string that contains multiple spaces. I want to replace these with a plus symbol. I thought I could use

var str = 'a b c';
var replaced = str.re开发者_运维知识库place(' ', '+');

but it only replaces the first occurrence. How can I get it replace all occurrences?

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You need the /g (global) option, like this:

var replaced = str.replace(/ /g, '+');

You can give it a try here. Unlike most other languages, JavaScript, by default, only replaces the first occurrence.

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Here's an alternative that doesn't require regex:

var str = 'a b c';
var replaced = str.split(' ').join('+');

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var str = 'a b c';
var replaced = str.replace(/\s/g, '+');

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You can also do it like:

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

Have a look at this fiddle.

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Use global search in the string. g flag

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

source: replaceAll function

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Use a regular expression with the g modifier:

var replaced = str.replace(/ /g, '+');

From Using Regular Expressions with JavaScript and ActionScript:

/g enables "global" matching. When using the replace() method, specify this modifier to replace all matches, rather than only the first one.

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You need to look for some replaceAll option

str = str.replace(/ /g, "+");

this is a regular expression way of doing a replaceAll.

function ReplaceAll(Source, stringToFind, stringToReplace) {
    var temp = Source;
    var index = temp.indexOf(stringToFind);

    while (index != -1) {
        temp = temp.replace(stringToFind, stringToReplace);
        index = temp.indexOf(stringToFind);
    }

    return temp;
}

String.prototype.ReplaceAll = function (stringToFind, stringToReplace) {
    var temp = this;
    var index = temp.indexOf(stringToFind);

    while (index != -1) {
        temp = temp.replace(stringToFind, stringToReplace);
        index = temp.indexOf(stringToFind);
    }

    return temp;

};

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NON BREAKING SPACE ISSUE

In some browsers

(MSIE "as usually" ;-))

replacing space in string ignores the non-breaking space (the 160 char code).

One should always replace like this:

myString.replace(/[ \u00A0]/, myReplaceString)

Very nice detailed explanation:

http://www.adamkoch.com/2009/07/25/white-space-and-character-160/

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Do this recursively:

public String replaceSpace(String s){
    if (s.length() < 2) {
        if(s.equals(" "))
            return "+";
        else
            return s;
    }
    if (s.charAt(0) == ' ')
        return "+" + replaceSpace(s.substring(1));
    else
        return s.substring(0, 1) + replaceSpace(s.substring(1));
}