Re: [Boost-users] Boost [Regex] (grep Falg) Why doesn't this patternmatch?

Subject: Re: [Boost-users] Boost [Regex] (grep Falg) Why doesn't this patternmatch?
From: John Maddock (john_at_[hidden])
Date: 2013-12-27 11:04:31

> In Boost Help, following is documented.
>
> Link -
> http://www.boost.org/doc/libs/1_55_0/libs/regex/doc/html/boost_regex/syntax/
> basic_syntax.html
>
> When an expression is compiled with the flag grep set, then the expression
> is treated as a newline separated list of POSIX-Basic expressions, a match
> is found if any of the expressions in the list match, for example:
>
> boost::regex e("abc\ndef", boost::regex::grep);
>
> will match either of the POSIX-Basic expressions "abc" or "def".

Right, but you're *not* passing a newline separated list, you're passing a 
\\n which is interpreted as an escape sequence matching a newline literal.

HTH, John.