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Run Rector on your code to see what it can do for you:

     {
     	$string = 'keys=1000';
         
-        $this->assertSame(1, preg_match('/^keys=(?P<count>\d+)/', $string, $matches));
+        $this->assertRegExp('/^keys=(?P<count>\d+)/', $string);
         $this->assertSame(1000, (int) $matches['count']);
     }
 }

PHP snippet to change

<?php

final class DemoTest extends PHPUnit\Framework\TestCase
{
    public function testFoo(): void
    {
    	$string = 'keys=1000';
        
        $this->assertSame(1, preg_match('/^keys=(?P<count>\d+)/', $string, $matches));
        $this->assertSame(1000, (int) $matches['count']);
    }
}

Applied Rules:

AssertRegExpRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\Set\PHPUnitSetList;

return RectorConfig::configure()
    ->withSets([
		PHPUnitSetList::PHPUNIT_CODE_QUALITY,
    ]);

Rector version: f84027 - released at 2026-07-15 19:02