fix RegexHeuristics _remove_pre_tag

app/converter/regex_heuristics.py

@@ -13,7 +13,7 @@ class RegexHeuristics:
 
         self.configurator = configurator
         self._rules = {
-            "^(</*pre.*?>)(?P<content>.*?)`{0,3}(<\/pre>)?$": self._remove_pre_tag,
+            "^(</*pre.*?>)`{0,3}(?P<content>.*?)(<\/pre>)?$": self._remove_pre_tag,
         }
 
     def _remove_pre_tag(self, match) -> str:

app/tests/converter/wordpress_markdown_test.py

@@ -124,6 +124,14 @@ def test_fix_html_tags_stripe_tag(input_lines, expected_lines):
             ],
             ["```", "    <ItemGroup>", "```"],
         ),
+        (
+            [
+                "```",
+                '<pre class="wp-block-syntaxhighlighter-code">```    <ItemGroup>',
+                "```",
+            ],
+            ["```", "    <ItemGroup>", "```"],
+        ),
         (
             [
                 "```",