Match Literals

Escaping

Case-insensitive

Regex is case-sensitive by default, to ignore case, add leading (?i).

regexp

(?i)ascii

cs

_ = new Regex(@"ascii", RegexOptions.IgnoreCase)

To partially ignore case, close partial regex using (?i)<regex>(?-i) The following matches ASCIIascciiascii but not asciiasciiASCII

ASCII(?i)aScIi(?-i)ascii