Allow closing fence to be followed by tabs.

Closes #258.
commonmark · Jun 3, 2022 · 4874cb4 · 4874cb4
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diff --git a/lib/blocks.js b/lib/blocks.js
@@ -47,7 +47,7 @@ var reATXHeadingMarker = /^#{1,6}(?:[ \t]+|$)/;
 
 var reCodeFence = /^`{3,}(?!.*`)|^~{3,}/;
 
-var reClosingCodeFence = /^(?:`{3,}|~{3,})(?= *$)/;
+var reClosingCodeFence = /^(?:`{3,}|~{3,})(?=[ \t]*$)/;
 
 var reSetextHeadingLine = /^(?:=+|-+)[ \t]*$/;
 

diff --git a/test/regression.txt b/test/regression.txt
@@ -227,3 +227,14 @@ https://talk.commonmark.org/t/link-label-collapse-all-internal-whitespace/3919/5
 .
 <p><a href="/url" title="title">foo</a></p>
 ````````````````````````````````
+
+Issue #258
+
+```````````````````````````````` example
+```
+abc
+```     
+.
+<pre><code>abc
+</code></pre>
+````````````````````````````````