/(?<fname>\w+\b) # Looks for "\w" (Word characters followed by a word 
+boundary (look up \w and \b)
                 # and creates $+{name}

\s(?<mname>\w+)\s # Same thing - Whitespace on both sides

(?<lname>\w+\s)   # Same thing 

.*\[(?<date>[^\]]+)/ # looks for "[", followed by anything that is NOT
+ "]", and populates $+{date}
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All this is in the "perlre" document.