John Machin <sjmac...@lexicon.net> added the comment:
@Ezio: Comparison of the behaviour of \letter inside/outside character classes
is irrelevant. The rules for inside can be expressed simply as:
1. Letters dDsSwW are special; they represent categories as documented, and do
in fact have a similar meaning outside character classes.
2. Otherwise normal Python rules for backslash escapes in string literals
should be followed. This means automatically that \a -> \x07, \A -> A, \b ->
backspace, \B -> B, \z -> z and \Z -> Z.
@Georg: No need to read the source, just read my initial posting: It's compiled
as a zero-length matcher ("at") inside a character class ("in") i.e. a
nonsense, then at runtime the illegality is deliberately ignored.
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<http://bugs.python.org/issue13899>
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