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

From: paul\.floyd (paul.floyd_at_[hidden])
Date: 2006-02-08 04:11:37

> Hi,
> 
>    I'm new to regex.  This is basically what I was trying.
> 
> #include <iostream>
> #include <boost/regex.hpp>
> 
> int main()
> {
>     std::string input = "sand._12";
>    boost::regex reg(".*\._[0-9]+");

Hi

In C++, you need to double your escape characters, so that in
order to pass '.*\._[0-9]+' to the RE, you need to pass
'.*\\._[0-9]+' to the compiler.

With the string that you use, the compiler will strip the sole
backslash, and the RE will get '.*._[0-9]+', which isn't what
you want.

A+
Paul

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