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Miscellaneous constructs either modify a regular expression pattern or provide information about it. The following table lists the miscellaneous constructs supported by the .NET Framework.

(?imnsx-imnsx)Sets or disables options such as case insensitivity in the middle of a pattern.\bA(?i)b\w+\b matches "ABA", "Able" in "ABA Able Act"
(?# comment)Inline comment. The comment ends at the first closing parenthesis.\bA(?#Matches words starting with A)\w+\b
#[to end of line]X-mode comment. The comment starts at an unescaped # and continues to the end of the line.(?x)\bA\w+\b#Matches words starting with A