Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

Availability

JavaScript 1.2; JScript 3.0; ECMAScript v3

Synopsis

regexp.test(string)

Arguments

string

The string to be tested.

Returns

true if string contains
text that matches regexp;
false otherwise.

Throws

TypeError

If this method is invoked on an object that is not a RegExp.

Description

test( ) tests string to
see if it contains text that matches
regexp. If so, it returns
true; otherwise, it returns
false. Calling the test method of a RegExp
r and passing it the string
s is equivalent to the following
expression:

(r.exec(s) != null) 

Example

var pattern = /java/i;
pattern.test("JavaScript");   // Returns true
pattern.test("ECMAScript");   // Returns false

See Also

RegExp.exec( ), RegExp.lastIndex, String.match( ), String.replace( ),
String.substring( ); Chapter 10