Replace function `\` error in the javascript

Question

I have a problem with the string symbol error, I want replace this symbol \, but it doesn't work. My sample code javascript like below the coding:

I am doing below this testing, cannot alert the message

var file_name = "C:\fakepath\claim 20210121 1754.sql";
var bbb = file_name.replace("C:\fakepath", "123");
alert(bbb);

If below the javascript code without \ , it can replace, the alert message is 123\fakepath\claim 20210121 1754.sql:

var file_name = "C:\fakepath\claim 20210121 1754.sql";
var bbb = file_name.replace("C:", "123");
alert(bbb);

Actually I want the alert message result is 123\claim 20210121 1754.sql

Try file_name.replace("C:\\fakepath", "123"); with 2 backslashes — Sal
– Sal, Commented Jan 22, 2021 at 4:41
Windows allows you to use forward slashes as directory separators. That will make things easier. — Barmar
– Barmar, Commented Jan 22, 2021 at 4:42

Barmar · Accepted Answer · 2021-01-22 04:46:53Z

2

Backslash begins escape sequences, you need to double them to make them literal.

var file_name = "C:\\fakepath\\claim 20210121 1754.sql";
var bbb = file_name.replace("C:\\fakepath", "123");
alert(bbb);

answered Jan 22, 2021 at 4:46

Barmar

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Comments

Alex · Accepted Answer · 2021-01-22 04:43:12Z

1

Escape the escape character (\) by doubling (\\) it:

const file_name = "C:\fakepath\claim 20210121 1754.sql"
const bbb = file_name.replace("C:\fakepath", "123\\")
const p = document.querySelector('pre')
p.innerText += bbb

<pre></pre>

Output:

123\claim 20210121 1754.sql

answered Jan 22, 2021 at 4:43

Alex

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