HTML and CSS Reference
In-Depth Information
EXAMPLE
17.4
<html>
<head>
<title>The test() method</title>
</head>
<body bgcolor="silver">
<font face="arial" size="+1">
<script type = "text/javascript">
1
var myString="I love my new gloves!";
2
var regex = /love/g;
//
Create a regular expression object
3
var booleanResult =
regex.test(myString);
if ( booleanResult != false ){
4
document.write("Tested regular expression <em>"+
regex.source
+ ".</em> The result is <em>"
+ booleanResult + "</em>");
document.write(".<br>Starts searching again at position " +
5
regex.lastIndex
+ " in string<em> \"" +
6
RegExp.input
+ "\"<br />");
document.write("The last matched characters were: "+
7
RegExp.lastMatch
+"<br />");
document.write("The substring preceding the last match is:
8
"+
RegExp.leftContext
+"<br />");
document.write("The substring following the last match is:
9
"+
RegExp.rightContext
+"<br />");
}
else{ alert("No match!"); }
</script>
</font>
</body>
</html>
EXPLANATION
1
The string object to be tested is created.
2
A regular expression object, called
regex
, is created.
3
The
test()
method returns
true
or
false
if the regular expression is matched in the
string.
4
The
source
property is applied to
regex
, an instance of a
RegExp
object. It contains
the text of the regular expression, /
love
/.
5
The
lastIndex
property is applied to an instance of a
RegExp
object. It represents
the character position right after the last matched string.
6
The
input
class property represents the input string on which the pattern match-
ing (regular expression) is performed.
7
lastMatch
is a class property that represents the characters that were last matched.
