HTML Preferred DTD Regex

This match condition requires Rules Engine - Mobile Device Detection Rules. This component of Rules Engine must be purchased separately. Contact your CDN account manager to activate it.

Category: Device

Purpose: Identifies requests by whether the device that issued the request has a preferred document type definition (DTD) for HTML content (e.g., html5) that matches the pattern defined by a Perl-compatible regular expressionThis type of value is interpreted as a regular expression that defines a pattern of characters..

Key information:

• A value may be defined using any combination of numbers, letters, and/or symbols. This value will be interpreted as a regular expression. Regular expressions are useful for defining a pattern of characters.

  Although regular expressions are quite powerful and can generate flexible solutions, it is strongly recommended that a regular expression statement be constructed, or at the very least proofed, by a developer on your team. This will ensure that the desired behavior will take place.
  
  For example, specifying a ".*" regular expression will match all requests, since the specified pattern matches 0 or more characters. A clearer way to match all requests is through the use of the Always match condition.

• The Ignore Case option determines whether a case-sensitive comparison will be made against the specified regular expression.
• The Result option determines whether this match condition will be met when the device's HTML preferred DTD is a "match" or does not match the specified regular expression.

• Due to the manner in which cache settings are tracked, this match condition is incompatible with the following features:

  • Complete Cache Fill (End-of-Life)
  • Default Internal Max-Age
  • Force Internal Max-Age
  • Ignore Origin No-Cache
  • Internal Max-Stale

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