Errata

This is the code section:

hex( 10 ); # decimal 10, converted to "10", then decimal 16
hex( 0x10 ); # hex 10, converted to "16", then decimal 22

In order to match the form of previous code sections, remove the semicolons.

Note from the Author or Editor:
Fixed in repo

Change "you might call something simple" to "you might call it something simple".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... it doesn't know what C division > is yet."

Change to:

"... it doesn't know what division is yet."

Note from the Author or Editor:
Fixed in repo

Change "has a special character in such" to "has a special character in it".

Note from the Author or Editor:
Fixed in repo

This is the part of the sentence:

"there's an iterator stored in with each hash"

Change to:

"there's an iterator stored in each hash"

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... but Perl is still out in front of most them in its power and expressitivity."

Change "expressitivity" to "expressivity".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"This also means that a pattern with a * at the start or end does more work than it needs to do."

Change "*" to ".*".

Note from the Author or Editor:
Fixed in repo

This is the code section:

fred
barney

Change to:

fred matched
barney matched

Note from the Author or Editor:
Fixed in repo

This is the code section:

fred
betty
barney

Change to:

fred matched
betty matched
barney matched

Note from the Author or Editor:
Fixed in repo

This is the line:

[a\-z] # hyphen or an a or an z

Change "an z" to "a z".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"You may use the same character shortcuts as in any double-quotish string to define a character, ..."

Remove "as".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... this is actually a shortcut for the m// (pattern match operator), the pattern match operator."

Change to:

"... this is actually a shortcut for m//, the pattern match operator."

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"A \k<label> is slightly different than \g{label}. In patterns that have two or more labeled groups with the same label, \k<label> and \g{label} always refer to the leftmost group, but \g{N} can be a relative back reference."

The way that \g{N} is mentioned here when comparing \k<label> with \g{label} is a bit confusing. Perhaps the text could be changed to the following:

"While \k<label> is essentially the same as \g{label}, the \g{} syntax can also be used to refer to a relative back reference (i.e. \g{N})."

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"In addition to the /g modifier, you can use the /i, /x, m/, and /s modifiers ..."

Change "m/" to "/m".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... the =~ is higher precedence than the =."

Change "is" to "has".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"That ß is equivalent of ss, but:"

Change "of" to "to".

Note from the Author or Editor:
Fixed in repo

This is the line:

my $folded = fc( $uncapped ); # fred

Change to:

my $folded = fc( $capped ); # fred

Note from the Author or Editor:
Fixed in repo

The text "5. " is missing before the 5th exercise.

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"If you need more than just a simple expression on each side, just write the code the old-fashioned way, with the parentheses and curly braces."

Change "each" to "either".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"Well, in the outer loop, that's what it is."

Change "is" to "holds".

Note from the Author or Editor:
Fixed in repo

This is the line:

50 years, 8 months, and 20 days

In order to match the exercise solution in Appendix A, change to:

50 years and 8 months

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"When you return from that subroutine and do another file test, the _ filehandle isn't for $file like you expect, but for $other_file:"

In order to match the code that follows, change "$file" to "$filename" and "$other_file" to "$other_filename".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"You'll see more about this when we talk about creating links to files in 13."

Change "13" to "Chapter 13".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... and reports for each one whether it's readable, nor writable, executable, or doesn't exist."

Remove "nor ".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"That is, you could type something like ./ex12-2 * to ask the program for the attributes of many files at once."

As this is part of Exercise 1, change "./ex12-2" to "./ex12-1".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... while the remaining arguments are the list of filenames to alter to those timestamps."

Change to:

"... while the remaining arguments are the list of filenames to alter those timestamps."

Note from the Author or Editor:
Fixed in repo

This is the line:

while( ) {

While an empty test is indeed treated as true in a while loop, it's a special case. Therefore change to:

while( 1 ) {

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"In that example, $date_tag gets something like "2038/01/19 3:00:08"."

There should be an extra space between 19 and 3. Therefore change "2038/01/19 3:00:08" to "2038/01/19 3:00:08".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"Without a leading zero in the formats, the resulting date-and-time string would have unwanted leading spaces instead of zeros, looking like "2038/ 1/19 3: 0: 8"."

There should be an extra space between 19 and 3. Therefore change "2038/ 1/19 3: 0: 8" to "2038/ 1/19 3: 0: 8".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"... having performed the Unix exec(2) system call (or equivalent)."

I am not finding a man page for "exec(2)". Perhaps it is outdated?

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"Note that $_ is a different value for each invocation, ..."

Change "is" to "has".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"As with the other generalized quotes, you mainly use this when the stuff inside the quotes is also the default delimiter."

Change to:

"As with the other generalized quotes, you mainly use this when the stuff inside the quotes also contains the default delimiter."

Note from the Author or Editor:
Fixed in repo

This is the line:

or die "fork: $!";

Change to:

or die "cannot pipe from find: $!";

Note from the Author or Editor:
Fixed in repo

This is the code section:

$ perl -e 'kill HUP = 12345'>

Change to:

$ perl -e 'kill HUP => 12345'

Also, part of the text is in bold font and part is not. All of the text (except the "$") should be in bold font.

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"Some of these errors are listed with an (X) code on the perldiag documentation, if you're curious."

Change "on" to "in".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"(If you need a file full of interesting strings to try matching, try the file sample_text in the files you've surely downloaded by now from the O'Reilly website; see Chapter 1.)"

Change "Chapter 1" to "Preface".

Note from the Author or Editor:
Fixed in repo

In order to match the text from the exercise question, change "(undefined)" to "(undefined value)".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"The my variable $pos is declared private to the scope of the for loop, and it starts with a value of -s1."

Change "-s1" to "-1".

Note from the Author or Editor:
Fixed in repo

This is the code section:

$ kill -HUP 61203
$ perl -e 'kill HUP = 61203'>
$ perl -e 'kill USR2 = 61203'>

Change to:

$ kill -HUP 61203
$ perl -e 'kill HUP => 61203'
$ perl -e 'kill USR2 => 61203'

Also, part of the text is in bold font and part is not. All of the text (except the "$") should be in bold font.

Note from the Author or Editor:
Fixed in repo

I get "404 Error - Not found" when I click the blog post link "Use the /N regex character class to get 'not a newline'".

Note from the Author or Editor:
Fixed in repo

This is the sentence:

"These experimental feature won't disturb your program ..."

Change "feature" to "features".

Note from the Author or Editor:
Change as noted.

This is the sentence:

"For OS X users, install the "command-line tools for XCode"."

Change to (there are 2 changes):

"For OS X users, install the "command line tools for Xcode"."

Note from the Author or Editor:
Change this to

For OS X users, install the "Command Line Tools" from Apple.

for ($i = 1; $i <= 10; $i++) { # OK now
print "I can count to $_!\n";
}

should be

for ($i = 1; $i <= 10; $i++) { # OK now
print "I can count to $i!\n";
}

Note from the Author or Editor:
Confirmed. Change as noted so $_ is $i

The first sentence reads:

"This is the first edition of our popular Perl 5 book after the release of Perl 6, a language that started its life as something based on Perl but has now taken a life of its own."

Change to "... but has now taken on a life of its own."
[taken a life -> taken on a life]

As written, it sounds like Perl is committing murder :-)

Note from the Author or Editor:
Change as noted.

'hello\nthere' # hellonthere
should be:
'hello\nthere' # hello\nthere

Note from the Author or Editor:
Fixed in repo

closing } of sub running_sum is indented two spaces, should be flush left

Note from the Author or Editor:
Change as noted

"Otherwise, the suboutine is the same."

should be:

"Otherwise, the subroutine is the same."

Note from the Author or Editor:
Change as noted

Exercise 4. is not numbered, and exercise 5 is numbered "4." (The answer key correctly has 4. and 5.)

Note from the Author or Editor:
Change as noted.

The open parenthesis before "especially" has no matching close parenthesis.

Note from the Author or Editor:
Fixed in repo

If you want to do a lot of grouping but no capturing, you can use the /n flag added in v5.22. It turns all parentheses into noncapturing groups:

if (/(?:bronto)?saurus (?:BBQ )?(?:steak|burger)/n) {
print "It matched\n"; # there is no $1 now
}

----------------------------------------------------
The ?: are all made superfluous by /n.

Note from the Author or Editor:
The code should change to:

if (/(bronto)?saurus (BBQ )?(steak|burger)/n) {
print "It matched\n"; # there is no $1 now
}

"Many poeple start"

should be:

"Many people start"

Note from the Author or Editor:
Change as noted

"also know as"

should be:

"also known as"

Note from the Author or Editor:
Change as noted.

The first sentence reads:

"There are several parts of the Perl documentation that will help you with the Perl parts"

Shouldn't this be:

"There are several parts of the Perl documentation that will help you with the Unicode parts"

Note from the Author or Editor:
Change as noted