使用正则表达式从对象文本中获取字符串

Question

I have some HTML that contain this script

   window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());

        gtag('config', 'UA-117747539-1', {
        'custom_map': {
            'dimension1': 'novel',
            'dimension2': 'chapter',
            'dimension5': 'novel_id',
            'dimension6': 'chapter_id'
        }
    });
    // Sends the custom dimension to Google Analytics.
    gtag('event', 'novel_dimension', {
        'novel': 'I'm The Most Evil Support Class【Talker】And I'll Subdue The Strongest Clan In The World',
        'chapter': 'Chapter: 002',
        'novel_id': '198',
        'chapter_id': '7756'
    });

I want to get the data novel_id and chapter_id from the object above using regex.

Is that possible?

Answer 1

If you REALLY have a string you can do this better than using a regex

 const str = `window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-117747539-1', { 'custom_map': { 'dimension1': 'novel', 'dimension2': 'chapter', 'dimension5': 'novel_id', 'dimension6': 'chapter_id' } }); // Sends the custom dimension to Google Analytics. gtag('event', 'novel_dimension', { 'novel': 'I'm The Most Evil Support Class【Talker】And I'll Subdue The Strongest Clan In The World', 'chapter': 'Chapter: 002', 'novel_id': '198', 'chapter_id': '7756' });` const script = document.createElement("script"); script.textContent=str; document.querySelector("head").appendChild(script) const dim = window.dataLayer[2][2]; // or recursively find object containing key===novel console.log(dim.novel_id,dim.chapter)

If actually an html page with a script then just

 window.dataLayer = window.dataLayer || []; function gtag() { dataLayer.push(arguments); } gtag('js', new Date()); gtag('config', 'UA-117747539-1', { 'custom_map': { 'dimension1': 'novel', 'dimension2': 'chapter', 'dimension5': 'novel_id', 'dimension6': 'chapter_id' } }); // Sends the custom dimension to Google Analytics. gtag('event', 'novel_dimension', { 'novel': 'I'm The Most Evil Support Class【Talker】And I'll Subdue The Strongest Clan In The World', 'chapter': 'Chapter: 002', 'novel_id': '198', 'chapter_id': '7756' }); const dim = window.dataLayer[2][2]; // or recursively find object containing key===novel console.log(dim.novel_id, dim.chapter)

Answer 2

Ok i was able to solv it this way instead

   var novRegex = /.*?novel_id'\s?:\s?'([\w\s]+)'/i
        var chapRegex = /.*?chapter_id'\s?:\s?'([\w\s]+)'/i

        var x1 = undefined;
        var x2 = undefined;
        var html = dom.head.innerText;
        x1 = html.match(novRegex)[1]
        x2 = html.match(chapRegex)[1]