How can I get at the matches when using preg_replace in PHP?



I am trying to grab the capital letters of a couple of words and wrap them in span tags. I am using preg_replace for extract and wrapping purposes, but it's not outputting anything.
preg_replace("/[A-Z]/", "<span class=\"initial\">$1</span>", $str)


Solution : 


 Put the match in parentheses, like this:
preg_replace("/([A-Z])/", "<span class=\"initial\">$1</span>", $str)



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