Showdown JS Video Link Finder - Extension

index.js

// Finds youtube and vimeo links in code and converts to iframes css below for 16/9
/*
.iframe-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    margin: 20px 0;
}
.iframe-wrapper iframe {
    display: block;
    border: none;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

*/
showdown.setFlavor('github');
showdown.extension('video-finder', function() {
    return [{
            type: 'lang',
            filter: function(text: any, converter: any, options: any) {
                var mainRegex = new RegExp(
                    /(?:(?:https?:)?(?:\/\/)?)(?:(?:www)?\.)?youtube\.(?:.+?)\/(?:(?:watch\?v=)|(?:embed\/))([a-zA-Z0-9_-]{11})/i,
                    'gm'
                );
                text = text.replace(mainRegex, function(match: any, content: any) {
                    return `\n<div class="iframe-wrapper"><iframe src="https://www.youtube.com/embed/${content}?rel=0" frameborder="0" allowfullscreen=""></iframe></div>\n`;
                });
                return text;
            },
        },
        {
            type: 'lang',
            filter: function(text: any, converter: any, options: any) {
                var mainRegex = new RegExp(/(?:(?:https?:)?(?:\/\/)?)?youtu\.be\/([a-zA-Z0-9_-]{11})/i, 'gm');
                text = text.replace(mainRegex, function(match: any, content: any) {
                    return `\n<div class="iframe-wrapper"><iframe src="https://www.youtube.com/embed/${content}?rel=0" frameborder="0" allowfullscreen=""></iframe></div>\n`;
                });
                return text;
            },
        },
        {
            type: 'lang',
            filter: function(text: any, converter: any, options: any) {
                var mainRegex = new RegExp(/(?:(?:https?:)?(?:\/\/)?)(?:(?:www)?\.)?vimeo.com\/(\d+)/i, 'gm');
                text = text.replace(mainRegex, function(match: any, content: any) {
                    return `\n<div class="iframe-wrapper"><iframe src="https://player.vimeo.com/video/${content}?rel=0" frameborder="0" allowfullscreen=""></iframe></div>\n`;
                });
                return text;
            },
        },
    ];
});
const converter = new showdown.Converter({
    extensions: ['video-finder']
});
converter.setOption('simplifiedAutoLink', true);