Closed
Bug 571875
Opened 14 years ago
Closed 14 years ago
Regular expression with global repeat in test() function gives unexpected result
Categories
(Firefox :: General, defect)
Tracking
()
People
(Reporter: hacklor, Unassigned)
Details
Attachments
(1 file)
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)
Testing the following regular expression in Javascript using the test() function gives unexpected results each time you test it.
/abc/g.test("abcdeabc")
Sometimes it returns true other times false.
Reproducible: Always
Steps to Reproduce:
The following HTML code:
<html>
<head>
<script type="text/javascript" charset="utf-8">
var num_passed = 0;
var num_failed = 0;
var times_tested = 0;
var value = "abcdeabc";
function reg_exp_test( value ) {
var num_passed = 0;
var num_failed = 0;
var times_tested = 0;
for(var i=0; i<10000; i++) {
times_tested++;
if( /abc/g.test(value) ) {
num_passed++;
} else {
num_failed++;
}
}
document.write("Value: '"+value+"'<br />");
document.write("Times tested: "+times_tested+"<br />");
document.write("Num passed: "+num_passed+"<br />");
document.write("Num failed: "+num_failed+"<br />");
document.write("<br />");
}
</script>
</head>
<body>
<h1>Regular Expression test</h1>
<script type="text/javascript" charset="utf-8">
reg_exp_test( "abcde" );
reg_exp_test( "abcdeabc" );
reg_exp_test( "abcdeabcdeabc" );
</script>
</body>
</html>
Actual Results:
Value: 'abcde'
Times tested: 10000
Num passed: 5000
Num failed: 5000
Value: 'abcdeabc'
Times tested: 10000
Num passed: 6667
Num failed: 3333
Value: 'abcdeabcdeabc'
Times tested: 10000
Num passed: 7500
Num failed: 2500
Expected Results:
You would expect that if you test the same regular expression with the same value you would get a true or a false form the test function consistently. (Like in IE or Safari, Opera shows the same problem)
It seems that the cursor for testing a regular expression with a global repeat does not reset to the beginning of the value for each test.
Removing the global repeat does return true each time.
Version: unspecified → 3.6 Branch
According to a friend the bug does not occur in the 3.7a6pre nightly build.
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Comment 4•14 years ago
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Updated•14 years ago
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Status: UNCONFIRMED → RESOLVED
Closed: 14 years ago
Resolution: --- → DUPLICATE
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Description
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