The manpage regex(7) is probably not user friendly, but generally speaking it is precise and accurate.
However, one point is wrong or at least misleading: The last section of the DESCRIPTION describes all together the "basic" regex and the concept of back reference, suggesting that back reference is specific to basic regex. I don't know the POSIX specification but on Linux/Debian/Ubuntu, the back reference is also valid in extended regex. I suggest to move the section on "back reference" section just before the section on basic regex. Regards -- Pascal MALAISE (priv) mailto:[EMAIL PROTECTED] (prof) mailto:[EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

