JavaScript – Replace all commas in a string [duplicate]

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The third parameter of String.prototype.replace() function was never defined as a standard, so most browsers simply do not implement it.

The best way is to use regular expression with g (global) flag.

var myStr="this,is,a,test";
var newStr = myStr.replace(/,/g, '-');

console.log( newStr );  // "this-is-a-test"

Still have issues?

It is important to note, that regular expressions use special characters that need to be escaped. As an example, if you need to escape a dot (.) character, you should use /\./ literal, as in the regex syntax a dot matches any single character (except line terminators).

var myStr="this.is.a.test";
var newStr = myStr.replace(/\./g, '-');

console.log( newStr );  // "this-is-a-test"

If you need to pass a variable as a replacement string, instead of using regex literal you may create RegExp object and pass a string as the first argument of the constructor. The normal string escape rules (preceding special characters with \ when included in a string) will be necessary.

var myStr="this.is.a.test";
var reStr="\\.";
var newStr = myStr.replace(new RegExp(reStr, 'g'), '-');

console.log( newStr );  // "this-is-a-test"

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