public static string ApplyFilters(string str, FilterOptions options)
{
StringBuilder sb = new StringBuilder(str.Length);
foreach (char c in str)
{
// c == Letter
if (c.IsLetter())
{
if (!options.HasFlag(FilterOptions.RemoveLetters))
{
sb.Append(c);
}
continue;
}
// c == Numeral
if (c.IsNumeral())
{
if (!options.HasFlag(FilterOptions.RemoveNumerals))
{
sb.Append(c);
}
continue;
}
// c == Space
if (c == ' ')
{
if (!options.HasFlag(FilterOptions.RemoveSpaces))
{
sb.Append(c);
}
continue;
}
// c == Special character
else
{
if (!options.HasFlag(FilterOptions.RemoveSpecialCharacters))
{
sb.Append(c);
}
continue;
}
}
return(sb.ToString());
}