regex - I need regular expression to replace everything than certain text -


I want to write a regular expression which can extract time data in the form in the following examples: 

 2 hours 2 hours 2 hours 30 minutes 2.5 hours  
 I am trying to get it written and written in regular expressions -  
  [^ 0-9 \ s ( H | h) in our (m | m)].   
 But when I test it - this letter matches 'our' and 'in' separately. I want to match only the words 'bell' and 'bell' and their Do not want subsets of characters   
 
 
 Maybe try to do something like that?  
  (\ d + (?: \. \ D +)?) \ S (?: H | h) ours? (?: \ S (\ d +) \ s (?: M | m) inutes?)?   
 The first group will be the number of hours, the second group is the number of minutes

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