Notes

The Value tag can be referenced in an If tag if the MATCH operation is used, but cannot be nested within any other tags. It can, however, appear anywhere else in the HTML as long as it follows the Handler tag. This tag can therefore be used to provide content for any HTML element.

When used in an If tag without the MATCH option, the condition is TRUE if Value evaluates to a non-empty string; otherwise, FALSE.

Regular expressions must be delimited. The first nonblank character after the = is the delimiter for the regular expression. The expression begins at the character following the delimiter and extends up to, but not including the next occurrence of that character.

Single or double quotes are common delimiters, but the delimiter may be any character. Examples:

1. {{ VALUE (QUERY_STRING, SERVER, MATCH=”?userid=fred\s”) }}
2. {{ VALUE (QUERY_STRING, SERVER, MATCH=/?userid=”fred\s”/) }}

(Note that QUERY_STRING is a server variable that contains the query string part of the URL.)

The second regular expression includes quotes, so a delimiter (/) was chosen that does not occur in the expression.

Another way to accomplish the above is to use the QUERYPARAM source option:

{{ VALUE(userid, QUERYPARAM, MATCH=”fred\s”, URLENCODE) }}

Commas cannot occur inside delimited or quoted strings because commas always separate parameters. If a comma is required, use "%2c" and URLDECODE the string to convert the "%2c" to a comma.