fork(4) download 
  1. set a "10.20.30.40"
  2. regsub {\.([0-9]+)\.([0-9]+)\.} $a {.\2.\1.} b
  3. puts $b
Success #stdin #stdout 0s 15904KB
comments (?)
stdin 
Standard input is empty
stdout 
10.30.20.40
https://ideone.com/dP1pKo
language:
TCL (tcl 8.6)
created:
9 years ago
visibility:
secret

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