php - The capturing group in the regular expression isn't output - 


  & lt ;? Php $ string = 'This is my regular expression'; $ Array = array (); Preg_match ('/^.* (my)) Regular (expression)?) $ / I', $ string, $ array); var_dump ($ array); ? & Gt;   
 After the execution of this script I have:  
  array (size = 4) 0 = & gt; String 'This is my regular expression' (length = 29) 1 = & gt; String 'regular expression' (length = 19) 2 = & gt; String '' (length = 0) 3 = & gt; String 'expression' (length = 10)   
 Why does not this capturing group (mine)?   
 
 
 The reason for this is that you have a greedy quantifier .  Before this you instead of the following kind of a non-greedy quantifier  * .  should use:  
  & lt ;? Php $ string = 'This is my regular expression'; $ Array = array (); Preg_match ('/^.*? ((My)? Regular (expression)?) $ / I', $ string, $ array); var_dump ($ array); ? & Gt;   
  
  [OUTPUT] array (size = 4) 0 = & gt; String 'This is my regular expression' (length = 29) 1 = & gt; String 'my regular expression' (length = 21) 2 = & gt; String 'Mary' (length = 2) 3 = & gt; String 'expression' (length = 10)

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