php - RegExp for capturing "headline" trigger words in textarea -

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I am trying to write a regexp for a "php preg_split" so that some text like "headline" Be captured

I want to use the resulting array to improve the formatting for the user and I want to create a streamlined view in the review posts. Prev_split ('/ [^ | N] * [\ t |] * \ b (Pro | Contra | Conclusion) \ b \: [\ t |] * / i ', $ Data [' review_text '], -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);

This is my sample text input 

  Introduction line one, the first part of the array Pro: Pro: Double Pro 1, no space between Pro: Pro: Pro: Pro: Between Pro, Pro: Pro Pro: Double Pro 2, Between Space, Pro Space: Should create blank Pro entry Contra: Conclusion: Last Contra was empty Conclusion: This Contra : These should not match this line! Conclusion: Test with spaces between the conclusions: Conclusions: The conclusion was prefixed by a space conclusion: This conclusion was prefixed by a tab conclusion: the conclusion was a space between the conclusions by two tabs: this conclusion There is a space between the conclusions and:   
 In this case [0] should be in the form of identification line, 4 Pro results (with their delimiter), 1 conte (Empty) and 7 result results (with their delimiter). Only the Contra should be empty and the last line should be a part of the final conclusion  
 I am trying to make some matches like this  
     
  1.  The beginning of the line, the start of the file  
  2.  Zero or n incidents of any white space character  
  3.  Any version of Pro, Contra or Conclusion (ignoring upper / lower case)  
  4.  Void Or any of the events of the N are white space characters  
  5. :   
     In this order   
     
     
     First of all,  [^ | \ n] *  It means 0 or more characters which is the pipe  |  or the line breaks are not. 
      [\ t | ] *  0 or more characters that are tabulation or pipe  |  or no place  
     I think you want:  
      / \ S * \ b (Pro | Contra | conclusion): [\ t] * / i

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