This applies to all Barracuda Spam Firewall firmwares 3.3.x and above.
All matches are case-insensitive. All regular expressions are converted to lower-case before use, as is the text against which it is being matched. For this reason, none of the capital letter character classes need be used.
For more help on writing regular expressions for the Barracuda Spam Firewall, see Solution #00003273.
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