Re: [Boost-users] Trouble with regex

Subject: Re: [Boost-users] Trouble with regex
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-03-28 14:58:31

AMDG

Nathan Huesken wrote:
> I have some trouble with regex.
> I have a string in this format:
>
> =?<encoding>?<Q or B>?<name>?=
>   

If you want a literal question mark, you need to escape it: "\\?"

> I want to extract the encoding, Q or B and name!
> I read the regex documentation and
> I try this:
>
> string mime_decode_field(string field)
> {
> 	boost::regex e("^=?([\x20-\x7E]*)?(Q|B)?([\x20-\x7E]*)?=$",boost::regex::perl|boost::regex::icase);
> 	boost::smatch what;
> 	if(boost::regex_match(field,what,e))
> 	{
>     //Now I expect <encoding> in what[1], <Q or B> in what[2] and <name> in what[3]
> 	}
> }
>
> But it is not as expected. what[2] and what[3] are empty, what[1]
> contains the whole string.
>   

In Christ,
Steven Watanabe