s/(\w+)(.*)(\w+)/$3$2$1/

##</code><code>##

s/(\w+)(.*?)(\w+)/$3$2$1/

##</code><code>##

s/(\w+)(.*?)(\w+)$/$3$2$1/

##</code><code>##

s/(\w+)(.*?)(\w+)(\W*)$/$3$2$1$4/

##</code><code>##

s/(\w+)(.*)\b(\w+)$/$3$2$1/