How to find the index of the first char in a string that is not in a list

I know I can loop over the string or build a regex or invert the set (ASCII isn't that big after all) and search for the first instance of that, but Yuck.

What I'm looking for is a nice one liner.

fewer features is better, LINQ is out (for me, don't ask, it's a long story)

The solution I'm going with (unless I see something better)

static int FirstNotMeta(int i, string str)
    for(; i < str.Length; i++)
            case '\\':
            case '/':
            case '.':
                return i;
    return -1;

OK, I cheated, I know in advance what char's I care about.


This works:

public static char FindFirstNotAny(this string value, params char[] charset)
    return value.TrimStart(charset)[0];

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