/*
* This static call constructs a RegexTree from a regular expression
* pattern string and an option string.
*
* The method creates, drives, and drops a parser instance.
*/
internal static RegexTree Parse(string re, RegexOptions op)
{
var culture = op.HasAnyFlags(RegexOptions.CultureInvariant)
? CultureInfo.InvariantCulture
: CultureInfo.CurrentCulture;
var p = new RegexParser(culture)
{
_options = op
};
p.SetPattern(re);
p.Reset(op);
var root = p.ScanRegex();
return(new RegexTree(root, op));
}
public static string ExpandCharClass(string charClass)
{
var regexParser = new RegexParser(CultureInfo.CurrentCulture);
regexParser.SetPattern(charClass);
var regexCharClass = regexParser.ScanCharClass(false);
int count = regexCharClass.RangeCount();
List <string> ranges = new List <string>();
// range 0 can be skipped
for (int i = 1; i < count; i++)
{
var range = regexCharClass.GetRangeAt(i);
ranges.Add(ExpandRange(range));
}
return(String.Concat(ranges));
}
