Regex escape sequences require one extra backslash

[FedericoStra]

I don't know whether this is the intended behavior, but I find it strange and confusing: regex search patterns require a double backslash to enter metacharacters and character classes.

For instance:

• r/\\( instead of r/\(,
• r/\\d instead of r/\d,
• r/\\W instead of r/\W,
• etc..

It's as if a single backslash on its own gets discarded: for instance r/\\.\t\x\t\$ will find files with a .txt extension.