Fix: multi level blockquote HTML to Markdown

lib/ExpensiMark.js

@@ -423,14 +423,28 @@ export default class ExpensiMark {
                 regex: /<(blockquote|q)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
                 replacement: (match, g1, g2) => {
                     // We remove the line break before heading inside quote to avoid adding extra line
-                    let resultString = g2
+                    let resultString = match
                         .replace(/\n?(<h1># )/g, '$1')
                         .replace(/(<h1>|<\/h1>)+/g, '\n')
                         .trim()
                         .split('\n');
 
-                    const prependGreaterSign = (m) => `> ${m}`;
-                    resultString = _.map(resultString, prependGreaterSign).join('\n');
+                    resultString = _.map(resultString, (m) => {
+                        // Recursive function to replace nested <blockquote> with ">"
+                        function replaceBlockquotes(text) {
+                            while (/<blockquote>/i.test(text)) {                             
+                                // Count how many <blockquote> tags
+                                let depth = (text.match(/<blockquote>/gi) || []).length;
+                                // Replace all blockquote tags and add ">" per depth level
+                                text = text.replace(/<blockquote>/gi, '');
+                                text = text.replace(/<\/blockquote>/gi, '');
+                                return `${'>'.repeat(depth)} ${text}`;
+                            }                          
+                            return text;
+                        }                   
+                        return replaceBlockquotes(m);
+                    }).join('\n');            
+
                     // We want to keep <blockquote> tag here and let method replaceBlockElementWithNewLine to handle the line break later
                     return `<blockquote>${resultString}</blockquote>`;
                 },