Email filters operator precedence

Peter Borosnyay

• August 28, 2024 11:58
• Edited

Hi all,

I wonder whether cPanel email filters follow standard mathematical logical operators precedence, or it uses another logic. I mean what if I add 5 filters with 4 operators, out of which 2 OR & 2 AND. Accordingly to normal rules, AND has higher precedence than OR, however it's common to use a scheme like (Filter1 OR Filter2 OR Filter3 OR ...) AND Filterx. But there are no parenthesis in cPanel's email filter GUI, how does it interpret a syntax like "Filter1 OR Filter2 OR Filter3 AND Filterx" ?

Thanks, Peter

• 

  Peter Borosnyay

  • August 28, 2024 12:08

  Do I really have to multiply the last ANDed Filter as many times as there are ORed ones ?

  And what about more complicated expressions ?

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• 

  cPRex Jurassic Moderator

  • August 28, 2024 14:23

  Hey there!  Email filters are read in the order they appear on the page, from top to bottom.  The OR conditions are also read in order the same way. 

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• 

  Peter Borosnyay

  • August 28, 2024 18:53
  • Edited

  So you say, given the expression :

  Filter1 OR Filter2 AND Filter3

  is interpreted as :

  1. Filter1 is evaluated.
  2. Filter2 is evaluated, and is ORed with Filter1. Let's name this Result1.
  3. Then, Filter3 is evaluated, and is ANDed with Result1.

  So therefore

  Filter1 OR Filter2 AND Filter3 = (Filter1 OR Filter2) AND Filter3
  Filter1 AND Filter2 OR Filter3 = (Filter1 AND Filter2) OR Filter3

  so

  Filter1 OP1 Filter2 OP2 Filter3 ... OPn Filtern
  is equal to
  (((Filter1 OP1 Filter2) OP2 Filter3) ...) OPn Filtern

  Really ?

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• 

  cPRex Jurassic Moderator

  • August 28, 2024 19:47

  I'm not sure what your bottom section means with all the parenthesis, but I agree with everything else, yes.

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