检查字符串是否包含环境变量

Question

In .Net we have method Environment.ExpandEnvironmentVariables that allows us to replace all environment variables that provided string contains into its values.

But what if I only want to check if string contains any environment variable? Of course I can compare string before and after expanding, but is there more elegant way to do that?

Answer 1

You could create an extension that does a Regex search against the string

public static bool HasEnvironmentVariable(this string path)
{
    Regex regex = new Regex(@"%[A-Za-z0-9\(\)]*%");
    Match match = regex.Match(path);

    return match.Success;
}