// Returns attribute set of attributes whose key matches any of regular expressions passed.
public AttributeSet MatchesAny(Regex[] rea)
{
AttributeSet matches = new AttributeSet();
foreach (var attr in this)
{
foreach (Regex re in rea)
{
if (re.IsMatch(attr.Key))
{
matches.Add(attr);
}
}
}
return(matches);
}