Allow code fences without newline chars

lib/ExpensiMark.js

@@ -24,16 +24,15 @@ export default class ExpensiMark {
                 name: 'codeFence',
 
                 // < is a backtick symbol we are matching on three of them before then after a new line character
-                regex: /```\n((?:(?!```)[\s\S])+)\n```/g,
-
+                regex: /(```[\n]?)((?:(?![\n]?```)[\s\S])+)([\n]?```)/g,
                 // We're using a function here to perform an additional replace on the content
                 // inside the backticks because Android is not able to use <pre> tags and does
                 // not respect whitespace characters at all like HTML does. We do not want to mess
                 // with the new lines here since they need to be converted into <br>. And we don't
                 // want to do this anywhere else since that would break HTML.
                 // &nbsp; will create styling issues so use &#32;
-                replacement: (match, firstCapturedGroup) => {
-                    const group = firstCapturedGroup.replace(/(?:(?![\n\r])\s)/g, '&#32;');
+                replacement: (match, _, secondCapturedGroup) => {
+                    const group = secondCapturedGroup.replace(/(?:(?![\n\r])\s)/g, '&#32;');
                     return `<pre>${group}</pre>`;
                 },
             },