How to use the substr function from url

notes.js

GitHub: zadam/trilium

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while (imageMatch = imageRe.exec(content)) {
    const url = imageMatch[1];
    const inlineImageMatch = /^data:image\/[a-z]+;base64,/.exec(url);

    if (inlineImageMatch) {
        const imageBase64 = url.substr(inlineImageMatch[0].length);
        const imageBuffer = Buffer.from(imageBase64, 'base64');

        const imageService = require('../services/image');
        const {note} = imageService.saveImage(noteId, imageBuffer, "inline image", true, true);

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+ 11 other calls in file