Regular expressions

A regular expression has the following syntax:

[<type>/]<expression>[/]

where:

<expression>: The regular expression itself.
<type>:
    PCRE[(<options>...)]:
        Perl-style regular expression (regex). Without any option, a "dot" will not match any newline. Set the option "da" to achieve this.
        <options>: A comma separated list of:
            da: DOT_ALL. All characters (including newlines) are accepted as '.' (for example in '.*')
            utf8: Perl-style regex using utf8 encoding.
            cs: Case-sensitive. The regex is case-sensitive.
            ci: Case-insensitive. The regex is case-insensitive. If both ("cs" and "ci") are set, then "ci" is taken.
     CIDR:
        CIDR notation of IP addresses and address ranges.
     GLOB:
        Unix style path pattern matching.
        Rules list:
            ? matches exactly one character.
            * matches zero or more characters, but not "/". When used alone between slashes ("/*/"), the wildcard requires at least one character.
            ** matches zero or more characters. This allows recursive directory matching.
            / matches one or more "/".
            [<CHARACTERS>] lists allowed characters at the specified position. For example [ABC]* allows paths starting with A, B or C.
            [<CHAR>-<CHAR>] matches a range of characters at the specified position. The previous example can be rewritten as [A-C]*.
            [!<CHARACTERS>] lists disallowed characters.
            The paths' ending can have any number of "/" characters.
            The backslash is used to escape wildcards (?, *, [, \). For example to match paths that contain "?", use the following rule: "**\?**".

If no type is specified, PCRE is taken. If a different type is set, it will be specified in the relevant parameter of the respective filter or servlet.