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m121212 <m121212@mailinator.com> writes:

> Thanks for your repsonses!  The solution for me in the end was just to record
> a keyboard macro.  Do you use a particular guide for regexps?  Also, could
> you explain this part:  {[^}]*} *$ RET ?

  {[^}]*} *$ means

  {          first an opening brace, 
  [^}]*      then any number of characters that are not a closing brace
  }          then a closing brace,
   *         any number of spaces,
  $          and the line ends there
  RET        RETURN to proceed

  This matches {xxx} 
  but not {xxx} \end{center} because the line does not end after the brace.

See http://www.emacswiki.org/emacs/RegularExpression