Question

I´ve got the following string from a .getAttribute():

ctl00$m$g_ff7ec6ac_ec2e_4402_aaaa_7fcce245ff1b$ctl03$_UserName

Let´s call it “String”. Now I need to replace the $ to a _ . I tried:

String.replace(/\$/g, "\_");

… doesn´t work.

Second try:

String.replace(/$$/g, "\_");

… doesn´t work.

Third try:

String.replace(/\$$/g, "\_");

… doesn´t work.

So… Ca anyone help? Thanks for all effort!

EDIT: Need to get it work for IE8/9

The code at this time:

mailName = document.body.innerHTML.match(/ctl00\$.+EmailAddress/);
alert(mailName); // String is "ctl00$m$g_ff7ec6ac_ec2e_4402_aaaa_7fcce245ff1b$ctl03$_UserName"

mailName2 = mailName.replace(/\$/g, "_");

EDIT2:

… I´va got the answer one my own.

mailName = document.body.innerHTML.match(/ctl00\$.+EmailAddress/);

gives a string back but .replace() or .split() won´t work with it. To get ot work you need to do it like this

mailID = '"' + document.body.innerHTML.match(/ctl00\$.+EmailAddress/) + '"';

after that everything is fine. Don´t know why, but in IE8/9 this solution works great.

Answer 1

Use

yourString = yourString.replace(/\$/g, "_");

No need to escape the second string.

From the MDN :

Returns a new string with some or all matches of a pattern replaced by
a replacement. The pattern can be a string or a RegExp, and the
replacement can be a string or a function to be called for each match.

Note also that replace doesn’t change the original string. You need to get back the returned value.

And, regarding your edit, note that the match function of Internet Explorer seems to return an array even without the g modifier :

If the match method does not find a match, it returns null. If it
finds a match, match returns an array, and the properties of the
global RegExp object are updated to reflect the results of the match.

You can do

var str = ''+ document.body.innerHTML.match(/ctl00\$.+EmailAddress/);

Demonstration