C# 囲まれた文字列の取り出し

複数行も可能

var bb="{{{aiueo}}}".capture(@"{{{", @"}}}"); //aiueo

    public static class RegexStringExtension{
        public static string capture(this string @this, string head, string tail)
        {
            /*usage
            var aa="(aiueo)".capture(@"\(",@"\)"); //aiueo
            var bb="{{{aiueo}}}".capture(@"{{{", @"}}}"); //aiueo
            */
            var p = head + "(.*?)" + tail;
            var ma = Regex.Match(@this, p, RegexOptions.Singleline);
            if (!ma.Success) return "";
            return ma.Groups[1].Value;
        }
    }