c# - Check if string contains strictly a string -

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I have a string that looks like this: str = P1 | P2 | P3 .... P3 ....

I need to see that the example P1 in the string includes: I do this: 

  if (str.Contains ("P1")) {...}   
 My problem comes when I am not in P1 and PR1, but P10 gives this right, which is logical But I do not need it, but I do not need it.  
 If I have P10 in the string then I have not returned the truth. 
 
 
 You can split the string into the array and then this Kindly check  
  bool bFound = str.split ('|'). Contains ("P1")

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