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I am trying to match the full word from some lines, want to know how to use or in regex For example, if I only have one keyword, it works fine, example 

  regex = ". * \\ b" + "KEYWORD1" + "\\ b. *"; String Reggae = ". * \\ b" + "KEYWORD1 | KEYWORD2 | KEYWORD3" + "\\ b. *"; For (int i = start; i  end; i ++) {if (line [i] .i (regex)) {System.out.println ("match"); }}    
 
 
 you want:  
  string Regex = ". * \\ b (KEYWORD1 | KEYWORD2 | KEYWORD3) \\ b. *";   
 Basically, your regex was evaluated in this way:  
 . * \ BKEYWORD1 | KEYWORD2 | KEYWORD3 \ b. *   
 But you want to:  
 . * \ B (KEYWORD1 | KEYWORD2 | KEYWORD3) \ b. *   
 This cooler can help you to analyze the regexes and find such bugs.

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