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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Miscellaneous Constructs 

The following table lists subexpressions that modify a regular expression.

Construct Definition


Sets or disables options such as case insensitivity to be turned on or off in the middle of a pattern. For information on specific options, see Regular Expression Options. Option changes are effective until the end of the enclosing group. See also the information on the grouping construct (?imnsx-imnsx: ), which is a cleaner form.

(?# )

Inline comment inserted within a regular expression. The comment terminates at the first closing parenthesis character.

# [to end of line]

X-mode comment. The comment begins at an unescaped # and continues to the end of the line. (Note that the x option or the RegexOptions.IgnorePatternWhitespace enumerated option must be activated for this kind of comment to be recognized.)

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