Handle Case Where Both Format and Value Contain Quotation Mark

src/PhpSpreadsheet/Style/NumberFormat/Formatter.php

@@ -14,6 +14,7 @@ class Formatter extends BaseFormatter
      * Matches any @ symbol that isn't enclosed in quotes.
      */
     private const SYMBOL_AT = '/@(?=(?:[^"]*"[^"]*")*[^"]*\Z)/miu';
+    private const QUOTE_REPLACEMENT = "\u{fffe}"; // invalid Unicode character
 
     /**
      * Matches any ; symbol that isn't enclosed in quotes, for a "section" split.
@@ -130,9 +131,17 @@ class Formatter extends BaseFormatter
                 return str_replace('@', $value, $format);
             }
             //escape any dollar signs on the string, so they are not replaced with an empty value
-            $value = str_replace('$', '\\$', (string) $value);
+            $value = str_replace(
+                ['$', '"'],
+                ['\\$', self::QUOTE_REPLACEMENT],
+                (string) $value
+            );
 
-            return str_replace('"', '', preg_replace(self::SYMBOL_AT, $value, $format) ?? $value);
+            return str_replace(
+                ['"', self::QUOTE_REPLACEMENT],
+                ['', '"'],
+                preg_replace(self::SYMBOL_AT, $value, $format) ?? $value
+            );
         }
 
         // If we have a text value, return it "as is"

tests/data/Style/NumberFormat.php

@@ -1682,24 +1682,44 @@ return [
         '#,##0.00;;"---"',
     ],
     'issue 4124' => ['1 HUF', 1, '#,##0_-[$HUF]'],
-    'issue 4242-0' => [
+    'issue 4242 General with dollar sign' => [
         'General $200 - 200', // expected result
         'General $200 - 200', // cell contents
         NumberFormat::FORMAT_GENERAL, // cell style
     ],
-    'issue 4242-1' => [
+    'issue 4242 Text with dollar sign' => [
         'Text $200 - 200',
         'Text $200 - 200',
         NumberFormat::FORMAT_TEXT,
     ],
-    'issue 4242-2' => [
+    'issue 4242 Text with quotes, format without' => [
         '"Hello" she said and "Hello" I replied',
         '"Hello" she said and "Hello" I replied',
         NumberFormat::FORMAT_TEXT,
     ],
-    'issue 4242-3' => [
+    'issue 4242 Format with quotes, text without' => [
         'Text: $200 - 200',
         '$200 - 200',
         '"Text: "' . NumberFormat::FORMAT_TEXT,
     ],
+    'issue 4242 single quote mark' => [
+        '"',
+        '"',
+        '@',
+    ],
+    'issue 4242 dollar sign' => [
+        '$100',
+        '$100',
+        '@',
+    ],
+    'issue 4242 repeat unquoted at signs' => [
+        'xy xy xy',
+        'xy',
+        '@ @ @',
+    ],
+    'issue 4242 quotes in format and text' => [
+        'Text: "Hooray" for me',
+        '"Hooray" for me',
+        '"Text: "' . NumberFormat::FORMAT_TEXT,
+    ],
 ];