The various options that can be applied to a regular expression are listed below along with a brief explanation.

Remarks

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Members

Member Name	Description
Compiled	Precompiles the regular expression into an assembly. Although this will speed up the execution time, the startup time will be increased. This is very useful for a static regular expression used constantly.
CultureInvariant	Enables the regular expression to ignore cultural differences in language when matching.
ECMAScript	Enables EMCAScript compliant behavior for the regular expression. It must be enabled in conjuction with IgnoreCase, Multiline, and Compiled or else it will raise an exception.
ExplicitCapture	This mode will change the behavior of the regular expression such that only captures which are explicitly named will be remembered. As a result, unnamed groups become noncapturing groups without the use of the (?:) style.
IgnoreCase	Enables case insensitive matching of the regular expression.
IgnorePatternWhitespace	Removes any unescaped whitespace in the pattern. It also enables comments which are identified by the '#' character.
Multiline	Changes the behavior of the metacharacters ^ and $. With this mode ^ matches the beginning of any line, and $ matches the end of any line. The default behavior is to mach the beginning and ending of the entire string.
None	This specifies that no options are set for the regular expression.
RightToLeft	Specifies that the regular expression be run right to left rather than left to right.
Singleline	This changes the behavior of the metacharacter . to mean any character rather than any character other than \n.

Requirements

Namespace: System.Text.RegularExpressions
Assembly: System (in System.dll)
Assembly Versions: 1.0.3300.0, 1.0.5000.0, 2.0.0.0