how to replace backslash character with double backslash in javascript?

Question

I'm trying to replace backslashes in my string with two backslashes like so:

s = s.replace("\\", "\\\\");

But, it doesn't do anything. Example string:

s="\r\nHi\r\n";

when you print the string (before the replace), does it show one or two backslashes? — Dale Wilson
– Dale Wilson, Commented Aug 3, 2013 at 19:58
The string in your example ("\r\nHi\r\n") does not contain a backslash. \r is the escape sequence for a carriage return and \n is the escape sequence for a line feed. The resulting string value does not contain the backslash character. Just do console.log(s) and you will see. If you'd explain what problem you are really trying to solve, we might be able to help you. — Felix Kling
– Felix Kling, Commented Aug 3, 2013 at 20:16
@user2049371 What Felix said is correct, the string does't contain escape sequences. View my example — Naveen Kumar Alone
– Naveen Kumar Alone, Commented Aug 3, 2013 at 20:18

Naveen Kumar Alone · Accepted Answer · 2013-08-03 20:39:51Z

2

The string doesn't contain a backslash, it contains the \r escape sequence.

For example

var str = "\r\n";
var replaced = str.replace('\r\n', '\\r\\n');
alert(replaced);

Then the alert will be shown \r\n

answered Aug 3, 2013 at 20:01

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2 Comments

@user2049371 one more option posted

for help => s = "\r\n" ;