Re: [Boost-users] [xpressive] static expression adding

12 Feb 2009

      "Eric Niebler"  wrote in message 
news:499444D3.2030806@boost-consulting.com...
...
You can nest regular expressions to get the same behavior.
sregex re0 = as_xpr('$');
sregex re1 = re0 >> +_d;
sregex re2 = re1 >> '.' >> _d >> _d;
You lose most of the benefits of static regular expressions when you do 
this, though.
You can also use BOOST_PROTO_AUTO if you have a sub-expression that's used a 
lot.
You have to include header .

For example:

//sregex re = '$' >> +_d >> '.' >> _d >> _d;

BOOST_PROTO_AUTO( re2, '.' >> _d >> _d);
sregex re = '$' >> +_d >> re2;

HTH,
Dave Jenkins