unicode "em space" in regex

[Fredrik Lundh]

Xah Lee wrote:

> "Regular expression pattern strings may not contain null bytes, but can
> specify the null byte using the \number notation."
>
> What is meant by null bytes here? Unprintable chars??

no, null bytes.  "\0".  "\x00".  ord(byte) == 0.  chr(0).

> and the "\number" is meant to be decimal? 

octal.  this is explained on the "Regular Expression Syntax" page.

> and in what encoding?

null byte encoding?  you're confused.

</F>