How to escape single quote within another string which contains single quote in javascript?

Question

Hi I want to escape single quote within another string.

I have the following string:

'I'm a javascript programmer'

In the above string , I need to escape single quote

and the expected output is:

'I\'m a javascript programmer'

I required this to handle in eval() in javascript.

The String would be like this...

"[['string's one','string two','string's three']]"

How to solve this. Thanks in advance...

Answer 1

var s = "my string's"
s = s.replace(/'/g, "\\'");

Answer 2

The proper way to escape quotes in an html string would be with a character entity.

'I'm a javascript programmer'

The same goes for double quotes:

'"I'm a javascript programmer"'

Answer 3

You can try lookahead assertions to achieve the desired effect:

var str = "'I'm a javascript's programmer'";
str = str.replace(/(?!^)'(?!$)/g, "\\'");

( Fiddle ). Unlike Shimon's answer, this can also deal with double single quotes ( '' ).

Negative lookahead assertion (?! ) doesn't do any matching by itself but it ensures that the asserted expression doesn't occur at the given position (ie start of string ^ doesn't occur before the quote and end of string $ doesn't occur after the quote).

Answer 4

This can do the trick:

var str = "'I'm a js programer.'";
str.replace(/(\w)'(\w)/g, "$1\\\'$2");