SimpleRegex.cs

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namespace System.Text;
 
internal static class SimpleRegex
{
    public static bool IsMatchWithStarWildcard(ReadOnlySpan<char> input, ReadOnlySpan<char> pattern)
    {
        int num = 0;
        int num2 = -1;
        int i = 0;
        int num3 = -1;
        while (num < input.Length)
        {
            if (i < pattern.Length && pattern[i] == '*')
            {
                num2 = num;
                num3 = ++i;
                continue;
            }
            if (i < pattern.Length && (pattern[i] == input[num] || char.ToUpperInvariant(pattern[i]) == char.ToUpperInvariant(input[num])))
            {
                num++;
                i++;
                continue;
            }
            if (num3 == -1)
            {
                return false;
            }
            num = ++num2;
            i = num3;
        }
        for (; i < pattern.Length && pattern[i] == '*'; i++)
        {
        }
        return i == pattern.Length;
    }
}