Re: [Boost-users] regex_replace with file streams

23 Aug 2005

      Thanks for the help.

My platform is Win32 and I was able to create a class:

class mystring: public std::iterator<std::bidirectional_iterator_tag, char >

mystring class opens the input file and maps it into memory using:
CreateFileMapping
MapViewOfFile

and I pass this into regex_replace. It seems to work - any thoughts?

Thanks again
Louis
...
-----Original Message-----
From: boost-users-bounces@lists.boost.org
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of John Maddock
Sent: Tuesday, August 23, 2005 11:08 AM
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] regex_replace with file streams
...
I want to use regex_replace to operate on a potentially large input 
file and output the results to another file. So, I can't load the 
entire file into a buffer in memory and pass it in as is done in the 
examples. I can't seem to figure out how to pass fstream or some other 
file I/O into regex_replace (ie create the proper iterator).
Take a look at the second example in
http://www.boost.org/libs/regex/doc/partial_matches.html
Unfortunately if you want to do a search and replace in an "infinite" text,
then you're not going to be able to use regex_replace.  Instead you'll have
to enumerate through the matches and copy unmatched sections to output, and
then call match_results::format on matched sections to get the text to
output for that section.
HTH, John.
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louis