private Regex(string pattern, RegexOptions options, TimeSpan matchTimeout, bool useCache)
{
// validate parameters:
if (pattern == null)
{
throw new ArgumentNullException(nameof(pattern));
}
if (options < RegexOptions.None || (((int)options) >> MaxOptionShift) != 0)
{
throw new ArgumentOutOfRangeException(nameof(options));
}
if ((options & RegexOptions.ECMAScript) != 0 &&
(options & ~(RegexOptions.ECMAScript |
RegexOptions.IgnoreCase |
RegexOptions.Multiline |
RegexOptions.CultureInvariant
#if DEBUG
| RegexOptions.Debug
#endif
)) != 0)
{
throw new ArgumentOutOfRangeException(nameof(options));
}
ValidateMatchTimeout(matchTimeout);
this.pattern = pattern;
this.roptions = options;
// Try to look up this regex in the cache. We do this regardless of whether useCache is true since there's
// really no reason not to.
var key = new CachedCodeEntryKey(options, pattern);
var cached = LookupCachedAndUpdate(key);
internalMatchTimeout = matchTimeout;
if (cached == null)
{
// Parse the input
var tree = RegexParser.Parse(pattern, roptions);
// Extract the relevant information
capnames = tree.CapNames;
capslist = tree.CapsList;
_code = RegexWriter.Write(tree);
caps = _code._caps;
capsize = _code._capsize;
InitializeReferences();
if (useCache)
{
CacheCode(key);
}
}
else
{
caps = cached._caps;
capnames = cached._capnames;
capslist = cached._capslist;
capsize = cached._capsize;
_code = cached._code;
_runnerref = cached._runnerref;
_replref = cached._replref;
_refsInitialized = true;
}
}
