Issues in Chapter 4: Regular Expressions Essentials

There are a couple of issues in Chapter 4 of the No Starch Press book.

1. There is a missing/extra line in sample set of email addresses.
On page 49
Listing 4-1 is as follows:

> $ cat ~/effective-shell/data/email-addresses.txt
dave@effective-shell.com
dave@effective-shell
to: dave@effective-shell.com
dave@effective-shell.com
test123.effective-shell.com
@yahoo.com
whatever123@😂.com
dave@kerr@effective.shell.com

however, on page 51-52 we see an additional line, "dave@":

> dave@effective-shell.com
dave@effective-shell
to: dave@effective-shell.com
dave@effective-shell.com
test123.effective-shell.com
@yahoo.com
dave@
whatever123@😂.com
dave@kerr@effective.shell.com

2. In the "Adding Special Characters" section starting on page 53, the first sentence reads as follows:

> To include more characters in the match, you can add them directly to your
character set—for example, the following pattern adds the +.

however, the pattern shown is:

> [\w\-.]+@[\w\-.]+

which adds the "-" and ".", but not the "+".