Thank you for reply, John. But after all I decided to write simple parser, and then write to new file with proper format. Best regards 2015-04-26 18:37 GMT+02:00 John Maddock :

On 26/04/2015 16:06, Fu ji wrote:

...

Hello all, I have file output.txt, in file we can find something like:

01/01/2015 15:00:00 2222.2222

2222.2222 2222.2222 2222.2222

04/04/2015 15:00:00 2222.2222

and i would like to change format from DD/MM/RRRR HH:MM:SS to RRRR-MM-DD HH:MM:SS.000 using boost regex. But I have no clue how should I type pattern and replace them with another.

Anyone have knowledge about boost regex and could help me ?

To take only the first part of the problem, then off the top of my head, something like:

boost::regex e("(\\d{2})/(\\d{2})/(\\d{4})");

Then if the contents of the file are in "mystring":

mystring = regex_replace(mystring, e, "$3/$2/$1");

HTH, John.

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