How to remove (beta) roms from romlist?

[Skullar]

Hi, first off I want to say that I'm glad I found out about AM, the BEST FE ever
But guys as a rookie I have a little problem, as the title says, I want to know how can I sort out the beta versions from the romlist? I created a filter called "USA titles", then I added the rules listed here: https://github.com/mickelson/attract/wiki/Example-filters to show US titles only, it worked okay; then I added this rule to try to filter out beta versions: "title does not contain (\beta\))", but seems that it's incorrect, or is it even posible to do this at all? thanks in advance!

[hermine.potter]

@Skullar
this works to me

in attract.cfg or add filter in AM itself:
   filter               "US NO BETA"
      rule                 Title contains (U)
      rule                 Title not_contains (BETA)

[RetroMacGamer]

This has worked well for me removing all unwanted roms from a full merged romset, tested on MAME 2014 0.159, providing the romlist you have is in the correct format with all the data

display   Arcade
   
   romlist              Arcade
   in_cycle             yes
   in_menu              yes
   global_filter       
      rule                 FileIsAvailable equals 1
      rule                 CloneOf not_equals .*
      rule                 Category not_contains Electromechanical|Tabletop|Casino|Quiz|Mahjong|Computer|Microcomputer|Test|Portable|Console|Handheld|Device|Training Board|Synthesiser|Clock|Document Processors|Mature|Rhythm|Instruments|Misc.|Fishing
      rule                 Category not_equals Misc.|Quiz / Korean|Electromechanical / Reels|Casino / Cards|Casino / Reels|Multiplay / Compilation|Puzzle / Misc.|Puzzle / Match|Utilities / Update
      rule                 Title not_contains bootleg|prototype|Mahjong|PlayChoice|Mega-Tech|Mega Play|Nintendo Super System|JAMMA
      rule                 Manufacturer not_contains bootleg
      rule                 Year not_contains ?
   filter               All
   filter               Favourites
      rule                 Favourite equals 1