How to remove a substring enclosed inside double quotes

Question

I have below string

"<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html></html>"

in which I want to remove the below part using JavaScript

PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"

such that the result should be

<!DOCTYPE HTML><html></html>

I have tries something like

console.log('Data', data);
data.replace("PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN" /"http://www.w3.org/TR/html4/loose.dtd/", "");
console.log('Data', data);

where data contains the complete string

but unfortunately both the logs print the same value.

thanks in advance

Don't use `"` as your string syntax. Use `\`` or `'` instead. As your string value has double quotes in it — evolutionxbox, Aug 31 '21 at 13:24

Tina Gordienko_Drog · Answer 1 · 2021-08-31T13:57:07.043

Variant 1:

const str = `<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html></html>`;
const index1 = str.indexOf('HTML');
const index2 = str.indexOf('<html>');
const result = `${str.slice(0, index1 + 4)}${str.slice(index2 - 1)}`;
console.log(result);

Variant 2:

const str = `<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html></html>`;
const index = str.indexOf('><html>');
const result = `${str.slice(0, 14)}${str.slice(index)}`;
console.log(result);

Variant 3 (without $):

const str = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html></html>';
const index = str.indexOf('><html>');
const firstPart = str.slice(0, 14);
const secondPart = str.slice(index);
const result = firstPart + secondPart;
console.log(result);

Also I can't assure if the make the input string to start with ` since its coming from a response — Amaarockz, Aug 31 '21 at 13:34

Kevin M. Mansour · Answer 2 · 2021-08-31T14:00:29.453

1

Adding the HTML as string and replacing the part that you want to remove.

let str = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"><html></html>";
str = str.replace(" PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"", "");

console.log(str);

edited Aug 31 '21 at 14:00

answered Aug 31 '21 at 13:42

Kevin M. Mansour

2,915
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Newbie · Answer 3 · 2021-08-31T13:50:12.813

0

If you do not have initial or final quotes:

let str = `<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html></html>`;
str = str.replace(`PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"`, '');
console.log(str);

But I suspect you are looking for something more, so please elaborate.

edited Aug 31 '21 at 13:50

answered Aug 31 '21 at 13:20

Newbie

4,462
11
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what does the last line do? – Amaarockz Aug 31 '21 at 13:23
it throws "invalid character" error for the second line – Amaarockz Aug 31 '21 at 13:30
It removes the initial and final `"` characters that are present in the provided string (unless is a typo). On my side it runs correctly under Node.js 12, Node.js 14, Chrome. Where are you running it? – Newbie Aug 31 '21 at 13:35
@Amaarrockz does your string starts with " – Newbie Aug 31 '21 at 13:44
Its a string only but on printing it on console it shows – Amaarockz Aug 31 '21 at 13:46
Its a string only but on console it prints as – Amaarockz Aug 31 '21 at 13:48

score 0 · Answer 4 · answered Aug 31 '21 at 13:31

Here's a simple code to ignore quotation marks and the text between them. If starting quote is identified, flag is set true. While flag == true we ignore the characters. Finally when ending quote is identified, flag is set false.

const str = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"><html></html>"
var flag = false
var newStr = ""
for (let i = 0; i < str.length; i++){
  if(str[i] == '"') flag = !flag
  if(!flag && str[i]!='"') newStr += str[i]
}
console.log(newStr)

Hopefully it fulfils your requirement. If you want to handle nested quotes, then let me know that.

this might remove the class names as well if they are enclosed in double quotes — Amaarockz, Aug 31 '21 at 13:33
You can add check for `class` `id` etc. to include the quotes that belong to them. — Sana Mumtaz, Aug 31 '21 at 19:55

How to remove a substring enclosed inside double quotes

4 Answers4