Suche
Lesesoftware
Specials
Info / Kontakt
Regex Quick Syntax Reference - Understanding and Using Regular Expressions
von: Zsolt Nagy
Apress, 2018
ISBN: 9781484238769 , 156 Seiten
Format: PDF, Online Lesen
Kopierschutz: Wasserzeichen
Preis: 39,99 EUR
eBook anfordern 
Table of Contents
4
About the Author
9
About the Technical Reviewer
10
Chapter 1: An Introduction to Regular Expressions
11
Why Are Regular Expressions Important?
11
What Are Regular Expressions?
12
Frustrations with Regular Expressions Arise from Lack of Taking Action
14
Regular Expressions Are Imperative
15
The Language Family of Regular Expressions
16
Summary
18
Chapter 2: Regex Syntax 101
19
Formulating an Expression
19
Literal Characters and Meta Characters
20
Arbitrary Character Class
23
Basic Concatenation
24
Alternative Execution
24
Operator Precedence and Parentheses
25
Anchored Start and End
25
Modifiers
29
Summary
31
Chapter 3: Executing Regular Expressions
32
Regular Expressions in JavaScript
32
RegExp Methods
34
String Methods Accepting Regular Expressions
35
Regex Modifiers
36
Global Matches
37
Multiline Matches
39
ES6 Unicode Regular Expressions
40
Sticky Matches
41
Summary
43
Other PCRE-Based Regex Environments
43
PHP
44
Python
46
Perl 5
49
Java
50
R
52
C#
53
Ruby
55
Golang
57
C++
58
Summary
60
Chapter 4: Visualizing Regex Execution Using Finite State Machines
61
Regular Expressions Are Finite State Machines
61
Backtracking
63
Deterministic and Nondeterministic Regex Modeling
64
Basic Regex Simplifications
70
A Successful Match Is Cheaper Than Failure
71
Automatically Generating Regex FSMs
71
Summary
74
Chapter 5: Repeat Modifiers
75
Backtracking
76
Match at Least Once
78
Match at Most Once: Optionals
80
Match Any Number of Times
81
Fixed-Range Matching
82
Loop Exactly n Times
85
Greedy Repeat Modifiers
86
Lazy Repeat Modifiers
87
Possessive Repeat Modifiers
90
Summary
92
Chapter 6: Character Sets and Character Classes
93
Character Sets
93
Character Set Ranges
95
Exclusions from Character Sets
96
Character Set Classes
96
Concatenating Advanced Language Constructs
100
Summary
101
Chapter 7: Substring Extraction from Regular Expressions
102
Defining Capture Groups
103
Perl 6 Capture Groups
104
Retrieval of Captured Substrings
105
JavaScript
107
PHP
108
Python
109
Perl 5
110
Reusing Captured Substrings Within a Regex
111
Capture Groups and Performance
113
Extensions to Capture Groups
115
Summary
115
Chapter 8: Lookahead and Lookbehind
116
Lookahead
116
Lookbehind
119
Summary
120
Chapter 9: Maintaining Regular Expressions
121
Extended Mode
122
Regex Subroutines
124
PCRE Subroutines
125
Perl 6 Subroutines
126
Recursion and Circular References with Subroutines
127
Extended Mode, Subroutines, and Abstractions
127
Named Capture Groups
128
EMACS Named Capture Groups
128
PCRE Named Capture Groups
128
Perl 6 Named Capture Groups
131
Case Study: XRegExp Library for JavaScript
131
Summary
134
Chapter 10: Optimizing Regular Expressions
136
Summary of the Optimization Techniques
137
Making Character Classes More Specific
137
Repeating Character Class Loops
139
Use Possessive Repeat Modifiers Whenever Possible
140
Use Atomic Groups
141
Refactor for Optimization
143
Optimization Techniques Limit Nondeterministic Execution
143
Summary
144
Chapter 11: Parsing HTML Code and URL Query Strings with Regular Expressions
145
Parsing HTML Tags
145
Processing the Query String of a URL
148
Afterword: This Is Not the End, but the Beginning
150
“What If I Want to Learn More?”
152
Keep in Touch
153
Index
154