Add escape characters to string javascript

Does JavaScript have a built-in function like PHP's addslashes [or addcslashes] function to add backslashes to characters that need escaping in a string?

For example, this:

This is a demo string with 'single-quotes' and "double-quotes".

...would become:

This is a demo string with \'single-quotes\' and \"double-quotes\".

asked Apr 20, 2009 at 23:50

Steve HarrisonSteve Harrison

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6

You can also try this for the double quotes:

JSON.stringify[sDemoString].slice[1, -1];
JSON.stringify['my string with "quotes"'].slice[1, -1];

Knu

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answered Apr 3, 2014 at 12:30

9

A variation of the function provided by Paolo Bergantino that works directly on String:

String.prototype.addSlashes = function[] 
{ 
   //no need to do [str+''] anymore because 'this' can only be a string
   return this.replace[/[\\"']/g, '\\$&'].replace[/\u0000/g, '\\0'];
} 

By adding the code above in your library you will be able to do:

var test = "hello single ' double \" and slash \\ yippie";
alert[test.addSlashes[]];

EDIT:

Following suggestions in the comments, whoever is concerned about conflicts amongst JavaScript libraries can add the following code:

if[!String.prototype.addSlashes]
{
   String.prototype.addSlashes = function[]... 
}
else
   alert["Warning: String.addSlashes has already been declared elsewhere."];

SharpC

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answered Mar 31, 2010 at 18:51

Marco DemaioMarco Demaio

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4

You can also use this

let str = "hello single ' double \" and slash \\ yippie";

let escapeStr = escape[str];
document.write["str : "+str];
document.write["
escapeStr : "+escapeStr];
document.write["
unEscapeStr :  "+unescape[escapeStr]];

answered Dec 30, 2020 at 13:23

1

escape['abc123'];     // "abc123"
escape['äöü'];        // "%E4%F6%FC"
escape['ć'];          // "%u0107"

// special characters
escape['@*_+-./'];    // "@*_+-./"

How do you escape characters in a string JavaScript?

How do I add an escape character to a string?

How do you write escape in JavaScript?

What is unescape [] and escape [] functions?