Talk:Regular Expressions/Syntaxes

This book is pretty confusing/confused. For example under the heading "Traditional Unix regular expressions" (which I actually thought was going to be a brief discussion on globbing) it describes what it calls "Simple Regular Expression" but it appears to be talking about Basic Regular Expressions (BREs) to some extent but then it also throws in the occasional Extended Regular Expression construct like RE-intervals.. It states that "Simple Regular Expressions" are defined as obsolete by POSIX, which I don't think is true at all and many tools still use BREs. It then goes on to the section on "POSIX modern (extended) regular expressions" as if EREs are the only type of RE defined by POSIX....

These comments were made by Ed Morton.