In every case that I have found the regular expression not working, I have looked carefully at the content and found my mistake every time. I would bet that it isnt finding a match because there is no match.
What you need to do is put a 'View Results Tree' on the http sampler that you want to match the regular expression and run the test cycle. When the "mis-match" occurs (the listener will keep a full history of all the pages fetched"), copy the Result Data to a file and then run the exact same regular expression over it using Perl 5.003. The same thing should happen.
If the regular expression works in Perl, then there is cause to investigate to the next level. If it doesnt, then either the page content is not what you are expecting, or you need to revise your regular expression.
BTW, I say Perl 5.003 becuase this is the equivalent regular expression engine that Jmeter uses. If you are not too familiar with Perl, then here is an example program to give you a jump start assuming that you saved the page content as "page.html":
#!/usr/bin/perl
# open file for reading open(IN, "page.html") || die "unable to open file";
# Run through each line looking to match the regular expression
# Note that if you use brackets (), the the results will be found
# in $1, $2 etc. E.g. $Line =~ /contentId=(\d+)/ then you could
# write in the if statement $contentId = $1;
while($Line = <IN>) {
if($Line =~ /<reg exp here>/) {
print "Found Match!";
}close(IN);
Vladimir Tsygankov wrote:
Hello, friends!
We noticed that JMeter from time to time doesn’t calculate regular
expressions in requests for some threads (our test has 20 threads). As a result we receive Exceptions from the server instead of correct
responses. We tried almost everything: increasing of Ramp-Up period,
time delay between requests, priority of java etc. It doesn’t help.
We’d like to have a guarantee that a regular expression has been
calculated before a request is sent.
Is there any settings for JMeter or for script to fix the problem?
Thanks in advance,
Vladimir
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