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From: jj.retorre@gmail.com (JJ. =?utf-8?B?UsOpdG9ycsOp?=)
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Subject: Regexp replacement problem
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I want to be prompted for a replacement string for each `l'
  in 

\begin{tabular}{lrlllcc}

matching p{?cm}.
I tried 
 M-x replace-regexp <RET> l <RET> p{\?cm} <RET>

but it doesn't work (nor \? only).

Help me!

-- 
JJR.