Regular Expressions are an essential part of programming, but they are hard to come to grips with, aren't they? Fortunately, we have the answer for you! Open Source Regular Expression Recipes provides you with all the open source regular expressions you'll ever need, and explains how to use each one. This way, you can learn by example, rather than muddling through endless pages of syntax explanation. Languages covered include Perl, PHP, grep, vim, Python, and shell. Web and applications developers, and system administrators will find the examples both accurate and relevant.

About the Author

ix

About the Technical Reviewer

xi

Acknowledgments

xiii

Introduction

xv

Syntax Overview

xix

Words and Text

1

(64)

Finding Blank Lines

2

(2)

Finding Words

4

(3)

Finding Multiple Words with One Search

7

(3)

Finding Variations on Words (John, Jon, Jonathan)

10

(3)

Finding Similar Words (Bat, Cat, Mat)

13

(3)

Replacing Words

16

(2)

Replacing Everything Between Two Delimiters

18

(2)

Replacing Tab Characters

20

(3)

Testing Complexity of Passwords

23

(3)

Finding Repeated Words

26

(2)

Searching for Repeated Words Across Multiple Lines

28

(2)

Searching for Lines Beginning with a Word

30

(2)

Searching for Lines Ending with a Word

32

(3)

Capitalizing the First Letter of a Word

35

(2)

Filtering Spam

37

(3)

Filtering Profanity

40

(3)

Finding Strings in Quotes

43

(3)

Escaping Quotes

46

(3)

Removing Escaped Sequences

49

(2)

Adding Semicolons at the End of a Line

51

(1)

Adding to the Beginning of a Line

52

(2)

Replacing Smart Quotes with Straight Quotes

54

(2)

Replacing Copyright Symbols

56

(1)

Replacing™ with (TM)

57

(2)

Splitting Lines in a File

59

(2)

Joining Lines in a File

61

(2)

Removing Everything on a Line After a Certain Character

63

(2)

URLs and Paths

65

(44)

Finding Log Files with Ranges

66

(3)

Extracting Query Strings from URLs

69

(3)

Extracting Hostnames from URLs

72

(3)

Formatting URLs

75

(4)

Translating Unix Paths to DOS Paths

79

(2)

Extracting Directories from Full Paths

81

(3)

Extracting Filenames from Full Paths

84

(3)

Extracting File Extensions from Full Paths

87

(3)

Replacing URLs with Links

90

(3)

Replacing E-mail Addresses with Links

93

(3)

Searching for Multiple File Types

96

(2)

Changing the Extensions of Multiple Files

98

(3)

Making URL Query String Substitutions

101

(4)

Rewriting URLs

105

(1)

Replacing IP Addresses in URLs

106

(3)

CSV and Tab-Delimited Files

109

(20)

Finding Bad CSV Records

110

(3)

Finding Bad Tab-Delimited Records

113

(3)

Changing CSV Files to Tab-Delimited Files

116

(4)

Changing Tab-Delimited Files to CSV Files

120

(4)

Extracting CSV Fields

124

(2)

Extracting Tab-Delimited Fields

126

(3)

Formatting and Validating

129

(66)

Formatting U.S. Phone Numbers

130

(2)

Formatting U.S. Dates

132

(3)

Validating Alternate Dates

135

(4)

Formatting Large Numbers

139

(3)

Formatting Negative Numbers

142

(2)

Formatting Single Digits

144

(2)

Limiting User Input to Alpha Characters

146

(2)

Validating U.S. Currency

148

(3)

Limiting User Input to 15 Characters

151

(2)

Validating IP Addresses

153

(3)

Validating E-mail Addresses

156

(3)

Validating URLs

159

(3)

Validating U.S. Phone Numbers

162

(3)

Validating U.S. Social Security Numbers

165

(3)

Validating Credit Card Numbers

168

(3)

Validating Dates in MM/DD/YYYY

171

(3)

Validating Times

174

(4)

Validating U.S. Postal Codes

178

(2)

Extracting Usernames from E-mail Addresses

180

(3)

Extracting Dialing Codes from International Phone Numbers

183

(3)

Reformatting People's Names (First Name, Last Name)

186

(3)

Finding Addresses with Post Office Boxes

189

(3)

Validating Affirmative Responses

192

(3)

HTML and XML

195

(24)

Removing Whitespace from HTML

196

(4)

Removing Whitespace from CSS

200

(3)

Making HTML Tags Lowercase

203

(2)

Removing an HTML Attribute

205

(5)

Searching for HTML Attributes

210

(3)

Escaping Characters for HTML

213

(2)

Finding Unclosed XML Tags

215

(4)

Coding and Using Commands

219

(68)

Finding Code Comments

220

(6)

Finding Lines with an Odd Number of Quotes

226

(3)

Reordering Method Parameters

229

(4)

Changing a Method Name

233

(2)

Removing Inline Comments

235

(2)

Commenting Out Code

237

(2)

Uncommenting Out Code

239

(2)

Searching for Variable Declarations

241

(4)

Searching for Words Within Comments

245

(3)

Filtering the Output of ps

248

(3)

Filtering the Output of netstat

251

(4)

Filtering the Output of du

255

(3)

Setting a SQL Owner

258

(3)

Finding a Method Declaration

261

(3)

Changing Null Comparisons

264

(3)

Changing DOS Text to Unix Text

267

(2)

Searching for a Subject in Mail Files

269

(3)

Formatting Bind Configuration Files

272

(2)

Parsing the Output of df

274

(3)

Parsing Apache Log Files

277

(4)

Parsing Unix syslog Files

281

(2)

Parsing INI Files

283

(4)

Index

287

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