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ReplaceRepeated info

• To: mathgroup at smc.vnet.net
• Subject: [mg77673] ReplaceRepeated info
• From: "alexxx.magni at gmail.com" <alexxx.magni at gmail.com>
• Date: Thu, 14 Jun 2007 06:19:30 -0400 (EDT)

Hi everybody,
I need to use in my program ReplaceRepeated, and also to know, after
it has been applied, how many times a replacement happened. Say, after
this:

 Log[d p q r] Log[a b c d]//.Log[x_ y_] ->Log[x] + Log[y]

(Log[a] + Log[b] + Log[c] + Log[d]) (Log[d] + Log[p] + Log[q] +
Log[r])


... I'd need to know that it performed 6 substitutions.
There is a way with //. , or have I to resort to some loop around /. ,
checking myself when no change happens anymore?


Thank you!

Alessandro Magni