Re: [Boost-users] Problem of using Boost::regex

From: John Maddock (john_at_[hidden])
Date: 2005-08-27 04:36:56

>I want to make a program to grep all symbols in header file,like:
>
> #define CMD_BASE      0x10000000
> #define CMD_GETFile   (CMD_BASE + 0X00000001) /* Get a file from srv*/
>
> A singl symbole definition line will be extract to three parts:
> 1. symbol itself
> 2. the value of a symbol, it's a signed 32-bit value
> 3. comments about the symbol
>
> I use the following pattern:
> std::string ptn = "\\s*#define\\s+([^\\s]+)\\s+([^/]*)([^\r\n]*)";
>
> I hope this pattern could do what I want, but when I use grep to do
> the parsing, I got from above two lines:

And so you should: the newline is a valid space character, if you don't want 
to match newlines then use [[:blank:]]+ instead.

John.