[FIX] Don't allow whitespace on bold, italic and strike (#21483)

app/markdown/lib/parser/original/markdown.js

@@ -60,13 +60,13 @@ const parseNotEscaped = (message, {
 	}
 
 	// Support *text* to make bold
-	msg = msg.replace(/(|&gt;|[ >_~`])\*{1,2}([^\*\r\n]+)\*{1,2}([<_~`]|\B|\b|$)/gm, '$1<span class="copyonly">*</span><strong>$2</strong><span class="copyonly">*</span>$3');
+	msg = msg.replace(/(|&gt;|[ >_~`])\*{1,2}([^\s^\*\r\n]+)\*{1,2}([<_~`]|\B|\b|$)/gm, '$1<span class="copyonly">*</span><strong>$2</strong><span class="copyonly">*</span>$3');
 
 	// Support _text_ to make italics
-	msg = msg.replace(/(^|&gt;|[ >*~`])\_{1,2}([^\_\r\n]+)\_{1,2}([<*~`]|\B|\b|$)/gm, '$1<span class="copyonly">_</span><em>$2</em><span class="copyonly">_</span>$3');
+	msg = msg.replace(/(^|&gt;|[ >*~`])\_{1,2}([^\s^\_\r\n]+)\_{1,2}([<*~`]|\B|\b|$)/gm, '$1<span class="copyonly">_</span><em>$2</em><span class="copyonly">_</span>$3');
 
 	// Support ~text~ to strike through text
-	msg = msg.replace(/(^|&gt;|[ >_*`])\~{1,2}([^~\r\n]+)\~{1,2}([<_*`]|\B|\b|$)/gm, '$1<span class="copyonly">~</span><strike>$2</strike><span class="copyonly">~</span>$3');
+	msg = msg.replace(/(^|&gt;|[ >_*`])\~{1,2}([^\s^~\r\n]+)\~{1,2}([<_*`]|\B|\b|$)/gm, '$1<span class="copyonly">~</span><strike>$2</strike><span class="copyonly">~</span>$3');
 
 	// Support for block quote
 	// >>>