Remove some urls from markdown with typescript

Question

Using Typescript and Node v8, I am trying to process a markdown text and remove all the image URLs that follow a specific pattern:

URLs that contain the word forbidden
URLs with IP addresses

I am trying using this regular expression:

![([^]]+)]((.(fordbidden|(?:[0-9]{1,3}.){3}[0-9]{1,3}).)\

This typescript code:

const markdownText =
            '\
            * ![Allowed image](http://accepteddomain/image.png)\
            * ![Forbidden domain image](http://fordbidden/image.png) \
            * ![Forbiden IP image](http://80.11.20.15/image.png) \
            ';

const forbiddenImages = /!\[([^\]]+)\]\((.*(fordbidden|(?:[0-9]{1,3}\.){3}[0-9]{1,3}).*)\)/gm;

function removeForbidden(markdown: string): string {
    return  markdown.replace(forbiddenImages,"![$1] ()");
}

console.log(removeForbidden(markdownText)

I am getting only the first line of the input:

* ![Allowed image] ()

Thanks in advance!

score 1 · Accepted Answer · answered Dec 11 '20 at 15:37

It seems to me the issue come from the back slashes used inside the string. I have tried using ` and it's working:

const markdownText =
            `
            * ![Allowed image](http://accepteddomain/image.png)
            * ![Forbidden domain image](http://fordbidden/image.png) 
            * ![Forbiden IP image](http://80.11.20.15/image.png)
            `;

const forbiddenImages = /!\[([^\]]+)\]\((.*(fordbidden|(?:[0-9]{1,3}\.){3}[0-9]{1,3}).*)\)/gm;

function removeForbidden(markdown: string) {
    return  markdown.replace(forbiddenImages,"![$1] ()");
}

console.log(removeForbidden(markdownText))

`

Remove some urls from markdown with typescript

1 Answers1