/// <summary>
/// Metoda vrátí true, pokud daný pattern je formálně správný a může být použit v metodě <see cref="CreateWildcardsRegex(string)"/>.
/// </summary>
/// <param name="pattern">Pattern s užitím standardních Wildcards * a ?</param>
/// <returns></returns>
public static bool IsWildcardsValid(string pattern)
{
if (pattern == null)
{
return(false);
}
pattern = pattern.Trim();
if (pattern.Length == 0)
{
return(false);
}
if (IllegalCharactersRegex.IsMatch(pattern))
{
return(false);
}
return(true);
}
/// <summary>
/// Metoda vrátí <see cref="Regex"/>, který dovoluje porovnávat texty se standardní Wildcards notací.
/// Tedy: text "Abcdefg" vyhovuje patternu "Ab??e*".
/// Volitelně lze požádat, aby <see cref="Regex"/> měl zapnutou option <see cref="RegexOptions.IgnoreCase"/>: true = ignoruje velikost znaků, false = neignoruje
/// </summary>
/// <param name="pattern">Pattern s užitím standardních Wildcards * a ?</param>
/// <param name="ignoreCase">true = ignoruje velikost znaků, false = neignoruje</param>
/// <returns></returns>
public static Regex CreateWildcardsRegex(string pattern, bool ignoreCase)
{
if (pattern == null)
{
throw new ArgumentNullException();
}
pattern = pattern.Trim();
if (pattern.Length == 0)
{
throw new ArgumentException("Pattern is empty.");
}
if (IllegalCharactersRegex.IsMatch(pattern))
{
throw new ArgumentException("Pattern contains illegal characters.");
}
bool hasExtension = CatchExtentionRegex.IsMatch(pattern);
bool matchExact = false;
if (HasQuestionMarkRegEx.IsMatch(pattern))
{
matchExact = true;
}
else if (hasExtension)
{
matchExact = CatchExtentionRegex.Match(pattern).Groups[1].Length != 3;
}
string regexString = Regex.Escape(pattern);
regexString = "^" + Regex.Replace(regexString, @"\\\*", ".*");
regexString = Regex.Replace(regexString, @"\\\?", ".");
if (!matchExact && hasExtension)
{
regexString += NonDotCharacters;
}
regexString += "$";
RegexOptions regexOptions = (ignoreCase ? RegexOptions.Compiled | RegexOptions.IgnoreCase : RegexOptions.Compiled);
Regex regex = new Regex(regexString, regexOptions);
return(regex);
}