Ignore square-$-brackets prefix in format string (#2886)

* Ignore square-$-brackets prefix in format string

* Test for square-$-brackets prefix in format string issue fixed

* Fix for phpstan compliance

* Additional assert for checking number format of tested source cell

Author: FlameStorm

src/PhpSpreadsheet/Style/NumberFormat/Formatter.php

@@ -112,6 +112,9 @@ public static function toFormattedString($value, $format, $callBack = null)
             return $value;
         }
 
+        // Ignore square-$-brackets prefix in format string, like "[$-411]ge.m.d", "[$-010419]0%", etc
+        $format = (string) preg_replace('/^\[\$-[^\]]*\]/', '', $format);
+
         $format = (string) preg_replace_callback(
             '/(["])(?:(?=(\\\\?))\\2.)*?\\1/u',
             function ($matches) {

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue2885Test.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+use PHPUnit\Framework\TestCase;
+
+class Issue2885Test extends TestCase
+{
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLSX/issue.2885.xlsx';
+
+    public function testIssue2885(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame('[$-809]0%', $sheet->getStyle('A1')->getNumberFormat()->getFormatCode());
+
+        $finishColumns = $sheet->getHighestColumn();
+        $rowsCount = $sheet->getHighestRow();
+        $rows = $sheet->rangeToArray("A1:{$finishColumns}{$rowsCount}");
+        self::assertSame('8%', $rows[0][0]);
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}