addslashes JavaScript equivalent

Question

I am looking for a proper version of a JavaScript equivalent of PHP's addSlashes.

I have found many versions, but none of them handle \b, \t, \n, \f or \r.

To be complete, this jsFiddle should alert: \b\t\n\f\r"\\

Delan Azabani · Accepted Answer · 2011-08-23T14:09:12.467

7

function addslashes(string) {
    return string.replace(/\\/g, '\\\\').
        replace(/\u0008/g, '\\b').
        replace(/\t/g, '\\t').
        replace(/\n/g, '\\n').
        replace(/\f/g, '\\f').
        replace(/\r/g, '\\r').
        replace(/'/g, '\\\'').
        replace(/"/g, '\\"');
}

Notice how I've used \u0008 to replace \b with \\b. JavaScript's regex syntax doesn't appear to accept \b, but it does accept \u0008. JavaScript's string literal syntax recognises both \b and \u0008.

edited Aug 23 '11 at 14:09

answered Aug 23 '11 at 14:02

Delan Azabani

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FWIW `replace(/\b/g, '\\b')` didn't work in my testing on jsfiddle. – Sean Bright Aug 23 '11 at 14:06
I've just noticed that, and edited my answer to use `\u0008`, which works. Seems like an inconsistency where JavaScript's regex syntax doesn't recognise `\b`. – Delan Azabani Aug 23 '11 at 14:08
`\b` is a boundary condition in regex and needs extra escaping: `\\b` should work. – jessehouwing May 05 '16 at 18:31

score 2 · Answer 2 · answered Aug 21 '12 at 01:37

2

Or this one from phpjs.org

function addslashes(str){
    return  (str + '').replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
}

answered Aug 21 '12 at 01:37

Emmanuel

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score 1 · Answer 3 · answered Jul 12 '13 at 07:12

1

Shorter and surprisingly more efficient:

 function as(str) {
    var a = {};
    a[str] = 1;
    return JSON.stringify(a).slice(1,-3);
  }

(slice(2, -4) if you don't need quotes around string)

answered Jul 12 '13 at 07:12

Andrey Sidorov

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score 0 · Answer 4 · answered Jun 28 '19 at 08:33

You need to escape the special character with a backslash \ . Simple and short -

let escapeString = unescapeString.replace(/([<>*()?])/g, "\\$1")

It will escape the special characters including these too.

NULL (0x00) --> \0 [This is a zero, not the letter O]

BS (0x08) --> \b

TAB (0x09) --> \t

LF (0x0a) --> \n

CR (0x0d) --> \r

SUB (0x1a) --> \Z

" (0x22) --> \"

% (0x25) --> \%

' (0x27) --> \'

\ (0x5c) --> \

_ (0x5f) --> _

addslashes JavaScript equivalent

4 Answers4