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Use wildcard characters * and ? to compare strings

, 20 Feb 2012 CPOL
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How about transforming first into a Regex and then letting the Regex do the work? E.g.:public static Regex GetRegex(string wildcard){ string pattern = Regex.Replace(wildcard, @"([^?*]+)?([?*])?", m => Regex.Escape(m.Groups[1].Value) +...
This is an old version of the currently published tip/trick.

How about transforming first into a Regex and then letting the Regex do the work? E.g.:

public static Regex GetRegex(string wildcard)
{
    string pattern = Regex.Replace(wildcard, @"([^?*]+)?([?*])?",
                 m => Regex.Escape(m.Groups[1].Value)
                    + (m.Groups[2].Value == "?"
                    ? "."
                    : m.Groups[2].Value == "*"
                    ? ".*"
                    : ""));
   return new Regex(pattern, RegexOptions.Compiled);
}
...
string wildcard = "..."; // E.g. "a$bc?ef*?z?*a";
var regex = GetRegex(wildcard);
...
string input = "...";
if (regex.Match(input).Success)
{
    ...
}

This could be an alternative approache depending on the situation. E.g., if you get the wildcard from outside, and if you apply the same pattern to many elements.

It would be interesting to see a performance comparison...

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Andreas Gieriet
Founder eXternSoft GmbH
Switzerland Switzerland
I feel comfortable on a variety of systems (UNIX, Windows, cross-compiled embedded systems, etc.) in a variety of languages, environments, and tools.
I have a particular affinity to computer language analysis, testing, as well as quality management.

More information about what I do for a living can be found at my LinkedIn Profile and on my company's web page (German only).

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