Substitute a literal dot inside quotes within number format masks to prevent it being mistaken for a decimal separator

CHANGELOG.md

@@ -34,6 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
+- Fix problem resulting from  literal dot inside quotes in number format masks. [PR #1830](https://github.com/PHPOffice/PhpSpreadsheet/pull/1830)
 - Resolve Google Sheets Xlsx charts issue. Google Sheets uses oneCellAnchor positioning and does not include *Cache values in the exported Xlsx. [PR #1761](https://github.com/PHPOffice/PhpSpreadsheet/pull/1761)
 - Fix for Xlsx Chart axis titles mapping to correct X or Y axis label when only one is present. [PR #1760](https://github.com/PHPOffice/PhpSpreadsheet/pull/1760)
 - Fix For Null Exception on ODS Read of Page Settings. [#1772](https://github.com/PHPOffice/PhpSpreadsheet/issues/1772)

src/PhpSpreadsheet/Style/NumberFormat.php

@@ -833,6 +833,14 @@ public static function toFormattedString($value, $format, $callBack = null)
             return $value;
         }
 
+        $format = preg_replace_callback(
+            '/(["])(?:(?=(\\\\?))\\2.)*?\\1/u',
+            function ($matches) {
+                return str_replace('.', chr(0x00), $matches[0]);
+            },
+            $format
+        );
+
         // Convert any other escaped characters to quoted strings, e.g. (\T to "T")
         $format = preg_replace('/(\\\(((.)(?!((AM\/PM)|(A\/P))))|([^ ])))(?=(?:[^"]|"[^"]*")*$)/u', '"${2}"', $format);
 
@@ -868,6 +876,8 @@ public static function toFormattedString($value, $format, $callBack = null)
             $value = $writerInstance->$function($value, $colors);
         }
 
+        $value = str_replace(chr(0x00), '.', $value);
+
         return $value;
     }
 

tests/data/Style/NumberFormat.php

@@ -88,6 +88,26 @@
         12345.678900000001,
         '#,##0.000',
     ],
+    [
+        '12.34 kg',
+        12.34,
+        '0.00 "kg"',
+    ],
+    [
+        'kg 12.34',
+        12.34,
+        '"kg" 0.00',
+    ],
+    [
+        '12.34 kg.',
+        12.34,
+        '0.00 "kg."',
+    ],
+    [
+        'kg. 12.34',
+        12.34,
+        '"kg." 0.00',
+    ],
     [
         '£ 12,345.68',
         12345.678900000001,