Message Filter - ' VS "

[Jessi Patterson]

When is the appropriate times to use ' or " when creating message filters?

Is ' used when you are adding in your own string of characters and " used for a system defined item like in the following example? 

header ("From") == 'example.com'

[Ken Stieers]

A note from this page : https://www.cisco.com/c/en/us/td/docs/security/esa/esa15-0/user_guide/b_ESA_Admin_Guide_15-0/b_ESA_Admin_Guide_12_1_chapter_01000.html

You must enclose the values in filters in either single or double quotation marks. Single or double quotation marks must be equally paired on each side of the value; for example, the expressions notify('customercare@example.com') and notify(customercare@example.com) are both legal, but the expression notify("customercare@example.com') causes a syntax error.


Basically, it doesn't matter, as long as they are paired... with the caveat that if you need to catch one in your search, you should use the other to wrap it...
Or use regex...

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