math_cms/app/Support/GradingMarkBoxCounter.php

<?php

namespace App\Support;

class GradingMarkBoxCounter
{
    public function countFillBlanks(?string $text): int
    {
        $text = (string) $text;
        $count = 0;
        $count += preg_match_all('/_{2,}/u', $text, $m);
        $count += preg_match_all('/（\s*）/u', $text, $m);
        $count += preg_match_all('/\(\s*\)/', $text, $m);

        return max(1, $count);
    }

    public function countAnswerSteps(?string $text): int
    {
        $text = (string) $text;
        if (!preg_match('/(步骤\s*\d+|第\s*\d+\s*步)/u', $text)) {
            return 1;
        }

        $parts = preg_split('/(?=步骤\s*\d+|第\s*\d+\s*步)/u', $text, -1, PREG_SPLIT_NO_EMPTY) ?: [];
        $count = 0;
        foreach ($parts as $part) {
            if (trim((string) $part) !== '') {
                $count++;
            }
        }

        return max(1, $count);
    }
}