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1．Advanced Regular Expressions1

Readable Regexes,/x and(?#…)1

Global Matching3

Global Match Anchors5

Recursive Regular Expressions7

Repeating a Subpattern7

Lookarounds18

Lookahead Assertions,(?=PATTERN)and(?!PATTERN)18

Lookbehind Assertions,(?<!PATTERN)and(?<=PATTERN)22

Debugging Regular Expressions25

The-D Switch25

Summary29

Further Reading29

2．Secure Programming Techniques31

Bad Data Can Ruin Your Day31

Taint Checking32

Warnings Instead of Fatal Errors34

Automatic Taint Mode35

mod_perl35

Tainted Data35

Side Effects of Taint Checking36

Untainting Data37

IO::Handle::untaint39

Hash Keys40

Taint::Util41

Choosing Untainted Data with Tainted Data41

Symbolic References42

Defensive Database Programming with DBI45

List Forms of system and exec47

Three-Argument open48

sysopen49

Limit Special Privileges49

Safe Compartments50

Safe Limitations56

A Little Fun56

Summary57

Further Reading58

3．Perl Debuggers61

Before You Waste Too Much Time61

The Best Debugger in the World62

Safely Changing Modules63

Wrapping Subroutines64

The Perl Debugger67

Alternative Debuggers68

Using a Different Debugger with-d68

Devel::ptkdb68

Devel::ebug70

Devel::hdb71

IDE Debuggers72

EPIC72

Komodo72

Summary72

Further Reading73

4．Profiling Perl75

Finding the Culprit75

The General Approach79

Profiling DBI81

Other DBI::Profile Reports85

Making It Even Easier86

Switching Databases87

Devel::NYTProf89

Writing My Own Profiler90

Devel::Line Counter90

Profiling Test Suites91

Devel::Cover91

Summary93

Further Reading93

5．Benchmarking Perl95

Benchmarking Theory95

Benchmarking Time97

Comparing Code100

Don't Turn Off Your Thinking Cap103

Isolating the Environment107

Handling Outliers109

Memory Use111

The perlbench Tool116

Summary118

Further Reading118

6．Cleaning Up Perl121

Good Style121

perltidy122

Deobfuscation124

De-encoding Hidden Source124

Unparsing Code with B::Deparse127

Perl::Critic129

Creating My Own Perl::Critic Policy132

Summary133

Further Reading134

7．Symbol Tables and Typeglobs135

Package and Lexical Variables135

Getting the Package Version137

The Symbol Table139

Typeglobs141

Aliasing144

Filehandle Arguments in Older Code146

Naming Anonymous Subroutines147

The Easy Way148

Summary149

Further Reading150

8．Dynamic Subroutines151

Subroutines as Data151

Creating and Replacing Named Subroutines155

Symbolic References157

Iterating Through Subroutine Lists159

Processing Pipelines161

Self-Referencing Anonymous Subroutines162

Method Lists162

Subroutines as Arguments163

Autoloaded Methods167

Hashes as Objects169

AutoSplit170

Summary171

Further Reading171

9．Modifying and Jury-Rigging Modules173

Choosing the Right Solution173

Sending Patches to the Author173

Local Patches175

Taking Over a Module175

Forking176

Starting Over on My Own176

Replacing Module Parts176

Subclassing179

An ExtUtils::MakeMaker Example181

Other Examples184

Wrapping Subroutines184

Summary186

Further Reading186

10．Configuring Perl Programs187

Things Not to Do187

Code in a Separate File189

Better Ways190

Environment Variables190

Special Environment Variables191

Turning on Extra Output191

Command-Line Switches193

The-s Switch194

Getopt Modules195

Configuration Files200

ConfigReader::Simple200

Config::IniFiles201

Config::Scoped201

Other Configuration Formats202

Scripts with a Different Name202

Interactive and Noninteractive Programs203

perl's Config204

Different Operating Systems205

Summary206

Further Reading206

11．Detecting and Reporting Errors207

Perl Error Basics207

Operating System Errors208

Child Process Errors210

Errors Specific to the Operating System212

Reporting Module Errors213

Separation of Concerns213

Exceptions215

eval216

Multiple Levels of die217

die with a Reference218

Propagating Objects with die220

Clobbering$@222

autodie224

Reporting the Culprit225

Catching Exceptions229

Try::Tiny229

TryCatch231

Polymorphic Return Values232

Summary233

Further Reading233

12．Logging235

Recording Errors and Other Information235

Log4perl236

Subroutine Arguments238

Configuring Log4perl239

Persistent Configuration243

Logging Categories243

Other Log::Log4perl Features245

Summary247

Further Reading247

13．Data Persistence249

Perl-Specific Formats249

pack249

Fixed-Length Records251

Unpacking Binary Formats251

Data::Dumper252

Similar Modules256

Storable258

Freezing Data259

Storable's Security Problem262

Sereal264

DBM Files269

dbmopen270

DBM::Deep270

Perl-Agnostic Formats272

JSON272

YAML274

MessagePack276

Summary277

Further Reading277

14．Working with Pod279

The Pod Format279

Directives279

Encoding281

Body Elements281

Translating Pod281

Pod Translators282

Pod::Perldoc::ToToc283

Pod::Simple285

Subclassing Pod::Simple288

Pod in Your Web Server288

Testing Pod288

Checking Pod289

Pod Coverage289

Hiding and Ignoring Functions291

Summary292

Further Reading292

15．Working with Bits293

Binary Numbers293

Writing in Binary294

Bit Operators295

Unary NOT(～)296

Bitwise AND (＆)298

Binary OR(|)299

Exclusive OR(＾)300

Left<<and Right>>Shift Operators302

Bit Vectors302

The vec Function304

Bit String Storage306

Storing DNA308

Checking Primes309

Keeping Track of Things311

Summary312

Further Reading312

16．The Magic of Tied Variables313

They Look Like Normal Variables313

At the User Level314

Behind the Curtain315

Scalars316

Tie::Cycle316

Bounded Integers319

Self-Destructing Values320

Arrays321

Reinventing Arrays322

Something a Bit More Realistic325

Hashes330

Filehandles333

Summary335

Further Reading335

17．Modules as Programs337

The main Thing337

Backing Up338

Who's Calling?339

Testing the Program340

Modules as Tests340

Creating a Program Distribution345

Adding to the Script347

Distributing the Programs352

Summary352

Further Reading353

A．Further Reading355

B．brian's Guide to Solving Any Perl Problem359

Index of Perl Modules in This Book366

Index369