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Chapter 9

Regular Expressions

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Figure 9-1

Regular Expression

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Figure 9-2

Atoms

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Figure 9-3

Single-Character Pattern Example

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Figure 9-4

Dot Atom Example

. Matches any character except \n (newline)

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Figure 9-5

Class Atom Example

A class of letters inside [], [a-z] , [abc], [A-Z0-9]

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Figure 9-6

Example of Classes

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Figure 9-7

Anchors

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Figure 9-8

Operators

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Figure 9-9

Example of Sequence Operator

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Figure 9-10 Evaluation of a String Using Sequence Operator

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Figure 9-11

Alternation Operator

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Figure 9-12

Matching Alternation Operators

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Figure 9-13

Repetition Operator

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Figure 9-14

Basic Repetition Forms

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Figure 9-15 Example of Short Form Repetition Operators

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Figure 9-16

Repeating Pattern Matching

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Figure 9-17

Greedy Matching

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Figure 9-18

Group Operator

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Figure 9-19 Saving