McAfee Security for Microsoft Exchange 8.6.0

Regular Expressions (regex)

Here are answers to frequently asked questions on the regular expressions (regex).

Does enabling regex cause email latency?
Yes, enabling regular expression causes email latency, as content scanning is a process intensive configuration.
Where do I find more information on regex?
Several websites on the Internet provide information on regular expressions.
To name a few, see:
How do I block certain Credit Card numbers and Social Security numbers using regex?
1 From the product's user interface, click Policy Manager | Shared Resource. The Shared Resources page appears.
2In the DLP and Compliance Dictionaries tab, click New Category and specify a category name.
3 Click OK.
4 Under DLP and Compliance Rules, click Create New.
5 Specify the Rule Name, Description and under Word or Phrase specify the regular expression.
Example: How to validate Credit Card Numbers
Card type Regular Expression Description
Visa ^4[0-9]{12}(?:[0-9]{3})?$ All Visa card numbers start with number 4. New cards have 16 digits. Old cards have 13.
MasterCard ^5[1-5][0-9]{14}$ All MasterCard numbers start with the numbers 51 through 55. All have 16 digits.
American Express ^3[47][0-9]{13}$ American Express card numbers start with 34 or 37 and have 15 digits.
Diners Club ^3(?:0[0-5]|[68][0-9])[0-9]{11}$ Diners Club card numbers begin with 300 through 305, 36 or 38. All have 14 digits. There are Diners Club cards that begin with 5 and have 16 digits. These are a joint venture between Diners Club and MasterCard, and should be processed like a MasterCard.
Discover ^6(?:011|5[0-9]{2})[0-9]{12}$ Discover card numbers begin with 6011 or 65. All have 16 digits.
JCB ^(?:2131|1800|35\d{3})\d{11}$ JCB cards beginning with 2131 or 1800 have 15 digits. JCB cards beginning with 35 have 16 digits.
Based on the example mentioned above, you can also create a similar regular expression for Social Security numbers. For more examples on regular expressions, refer .
6 Select the Regular Expression option and click Save.
7 Add this to the DLP and Compliance policy in Policy Manager by clicking Policy Manager | On-Access (Master Policy) | DLP and Compliance.
8 Under Activation, select Enable.
9 Under DLP and Compliance rules and associated actions, click Add rule.
10 Under Select rules group, select the regex rule that you created earlier from the drop-down list.
11 Specify the action to take, when the rule is triggered.
12 Click Save.