fun with perl: 

substr($_, pos() - 3, 3) =~ tr/FSTRE\\/|^&~\\/d
  while m/\G.*?\\[FSTRE]\\/gs;

[download]
Note: s modifier is required in the regexp

Update: regexp was simplified 

substr($_, pos() - 3, 3) =~ tr/FSTRE\\/|^&~\\/d
  while m/\\[FSTRE]\\/g;

[download]

In reply to Re^2: Pattern Matching, left-to-right by ccn
in thread Pattern Matching, left-to-right by TrekNoid

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