Re: [Boost-users] Boost regexp (Perl) throws initialization error for [^\0x21-\0xfe]

From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2006-04-24 11:54:39

Brad Barber wrote:

> If my code contains the following regexp,
>
>             const boost::tregex non_printables(__T("[^\0x21-\0x7E]+"));
>
>  
>
Don't forget that your pattern is scanned first by the C++ compiler. In 
this case, this means that \0x21 is never seen by the RegExp engine; 
instead, it sees a NUL character (ASCII 0) followed by "x21". NUL is not 
valid in any pattern and thus an exception is thrown. Use double 
backslashes to get a backslash through to the engine.

Sebastian Redl