How can I remove everything in brackets or a particular word and beyond in Notepad++?

I need to omit everything from ( and beyond, or everything from http and beyond

• Menu "Search" > "Replace" (or Ctrl + H)

• Set "Find what" to \(.*?$|http.*?$

• Leave "Replace with" empty

• Enable "Regular expression"

• Click "Replace All"

  

Before:

PCSH10160   Attack of the Toy Tanks (3.61+!) [3.69] http://zeu
PCSH10162   Paradox Soul    http://zeus.dl.playstation.net/cdn
PCSH10146   Hoggy2  http://zeus.dl.playstation.net/cdn/HP2005/
PCSB01394   Mekabolt    http://zeus.dl.playstation.net/cdn/EP0
PCSH10186       Himno   http://zeus.dl.playstation.net/cdn/HP2
PCSG01285   MELLKISS    http://zeus.dl.playstation.net/cdn/JP0
PCSB01365   Habroxia    http://zeus.dl.playstation.net/cdn/EP5
PCSE01423   Color Slayer    http://zeus.dl.playstation.net/cdn
PCSE01396   Habroxia    http://zeus.dl.playstation.net/cdn/UP4
PCSG01127   Sen no Hatou, Tsukisome no Kouki    http://zeus.dl
PCSB01396   Tic-Tac-Letters by POWGI    http://zeus.dl.playsta
PCSH10203       Gravity Duck    http://zeus.dl.playstation.net
PCSH10175       Crossovers by POWGI http://zeus.dl.playstation
PCSH10169       Mixups by POWGI (3.61+!) [3.69] http://zeus.dl
PCSH10167       One Word by POWGI   http://zeus.dl.playstation
PCSH10166       Word Search by POWGI    http://zeus.dl.playsta
PCSH10179       Word Wheel by POWGI http://zeus.dl.playstation
PCSH10180       Wordsweeper by POWGI    http://zeus.dl.playsta
PCSH10168       Word Sudoku by POWGI    http://zeus.dl.playsta
PCSB00625   SENRAN KAGURA: Bon Appétit! Stacked Soundtrack  ht

After:

PCSH10160   Attack of the Toy Tanks 
PCSH10162   Paradox Soul    
PCSH10146   Hoggy2  
PCSB01394   Mekabolt    
PCSH10186       Himno   
PCSG01285   MELLKISS    
PCSB01365   Habroxia    
PCSE01423   Color Slayer    
PCSE01396   Habroxia    
PCSG01127   Sen no Hatou, Tsukisome no Kouki    
PCSB01396   Tic-Tac-Letters by POWGI    
PCSH10203       Gravity Duck    
PCSH10175       Crossovers by POWGI 
PCSH10169       Mixups by POWGI 
PCSH10167       One Word by POWGI   
PCSH10166       Word Search by POWGI    
PCSH10179       Word Wheel by POWGI 
PCSH10180       Wordsweeper by POWGI    
PCSH10168       Word Sudoku by POWGI    
PCSB00625   SENRAN KAGURA: Bon Appétit! Stacked Soundtrack  ht

Note:

• The last example line is not correct but will be when you apply against the untruncated file.
• To truncate the lines containing MISSING change "Find what" to \(.*?$|http.*?$|MISSING.*?$

Following conversations in the comments the fastest regular expression is

• \h+(?:\(|http|MISSING).+$

Further reading

• FAQ Desk: Where to find REGEX documentation ? | Notepad++ Community
• Notepad++: A guide to using regular expressions and extended search mode
• Regular Expressions Tutorial
• RegExr: Learn, Build, & Test RegEx
• regex101: Online regex tester and debugger

Improve performance (thanks to @IsmaelMiguel) & answer new requierement.

• Ctrl+H
• Find what: \h+(?:\(|http|MISSING).+$
• Replace with: LEAVE EMPTY
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• UNCHECK . matches newline
• Replace all

Explanation:

\h+             # 1 or more horizontal spaces
(?:             # non capture group
    \(              # opening parenthesis
  |               # OR
    http            # literally
  |               # OR
    MISSING         # literally
)               # end group
.+              # 1 or more any character but newline
$               # end of line

Screenshot (before):

Screenshot (after):