regex - Match LAST_NAME, FIRST_NAME and replace with FIRST_NAME LAST_NAME with regular expressions -


i haven't had use regular expressions in time, find myself trying 

(?<lastname>[a-za-z]+\,) (?<firstname>[a-za-z]+)

as matching pattern, think i'm going down wrong path, let alone replacement pattern, why thought return pattern names.

replace:

([a-za-z]+), ([a-za-z]+)

with:

$2 $1

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