JavaScript JS string replace only replacing every other occurence string replace only first instance c#,string replace only first

It's because this regex /(^|\s)a(\s|$)/g match the previous char and the next char to each a

in string "a a a a" the regex matches :

"a " , then the string to check become "a a a"$ (but now the start of the string is not the beginning and there is not space before)
" a " (the third a) , then become "a"$ (that not match because no space before)

Edit: Little bit tricky but working (without regex):

var a = "a a a a";

// Handle beginning case 'a '
var startI = a.indexOf("a ");
if (startI === 0){
    var off = a.charAt(startI + 2) !== "a" ? 2 : 1; // test if "a" come next to keep the space before
    a = a.slice(startI + off);
}

// Handle middle case ' a '
var iOf = -1;
while ((iOf = a.indexOf(" a ")) > -1){
    var off = a.charAt(iOf + 3) !== "a" ? 3 : 2; // same here
    a = a.slice(0, iOf) + a.slice(iOf+off, a.length);
}

// Handle end case ' a'
var endI = a.indexOf(" a");
if (endI === a.length - 2){
    a = a.slice(0, endI);
}

a; // ""

Answer:1

(^|\s)a(?=\s|$)

Try this.Replace by $1.See demo.

https://regex101.com/r/gQ3kS4/3

Answer:2

Use this instead:

"a a a a".replace(/(^|\s*)a(\s|$)/g, '$1')

With "* this you replace all the "a" occurrences

Greetings

Answer:3

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