Regular Expressions and Pattern Matching - JavaScript by Example

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Figure 17.12 The user entered Steven lives in Cleveland , one uppercase letter [A-

Z] , followed by one lowercase letter [a-z] , followed by eve . This matches both

Steven and Cleveland .

Figure 17.13 When the user entered Believe! (top), it didn't match (bottom).

Would it have matched if he or she had entered BeLieve . Why?

EXAMPLE 17.13

<html>

<head><title>The Character Class</title></head>

<body>

// Character class

1

var reg_expression = /[A-Za-z0-9_]/; // A single alphanumeric

// word character

2

var textString=prompt("Type a string of text","");

3

var result=reg_expression.test(textString); // Returns true

// or false

Continues

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