/// <summary>
/// Creates and caches a Regex object for later use and retrieves it in a later call if it is cacehd
/// </summary>
public static Regex GetCachedRegex(string pattern, RegexOptions options = RegexOptions.None, int timeoutSeconds = 2)
{
Requires.NotNull("pattern", pattern);
string key = pattern;
if ((options & RegexOptions.IgnoreCase) != 0)
{
key = (options & RegexOptions.CultureInvariant) != 0
? pattern.ToUpperInvariant()
: pattern.ToUpper();
}
// // should not allow for compiled dynamic regex object
options &= ~RegexOptions.Compiled;
key = string.Join(":", "REGEX_ITEM", options.ToString("X"), key.GetHashCode().ToString("X"));
// limit timeout between 1 and 10 seconds
if (timeoutSeconds < 1)
{
timeoutSeconds = 1;
}
else if (timeoutSeconds > 10)
{
timeoutSeconds = 10;
}
CachingProvider cache = CachingProvider.Instance();
Regex regex = cache.GetItem(key) as Regex;
if (regex == null)
{
regex = new Regex(pattern, options & ~RegexOptions.Compiled, TimeSpan.FromSeconds(timeoutSeconds));
cache.Insert(key, regex, null, Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(10), CacheItemPriority.BelowNormal, null);
}
return(regex);
}