Re: [Boost-users] [Regex] : Unknown character sequence.

From: John Maddock (john_at_[hidden])
Date: 2006-02-08 05:28:56

> I get a warning which says "Unknown escape sequence '\.' .  Its the
> same case with any other special character or even '\s' .
>
> I guess I'm missing something very simple.

Yep: escapes are parsed first by the compiler *before* the regex engine gets 
to see the string, the compiler is complaining because \. is not a valid 
escape sequence for strings in C++.  You want to use "\\." so that a literal 
'\' gets passed through to the regex engine to see: it then handles the '\.' 
sequence as a regex.

John.