How to extract All of reg expression matches from html page via JMeter

Question

I have a html page containing userIds of students. I need to extract all the userId values from this html page and use them in a parameter of JMeter HTTP request..

For example i have following data on htm page.

<input type="checkbox" StudentID="1503"
<input type="checkbox" StudentID="1504"
<input type="checkbox" StudentID="1505"

so on..

The value I need to send in parameter is like this selectedIds= 1503,1504,1505 and so on..

Now I am not sure how I can get the result that i need to send in my second request. I can extract & use one value at a time but could not figure out how to get values like I require "1503,1504,1505..."

Currently my Reg Exp extractor is like this

Reference Name: myTestVar Reg Expression: StudentID="(.+?)" Template: $1$ MatchNo: -1

In my second request I am referencing to variable ${myTestVar}

Please guide what else I need to do to get the results in desired way..

"1504,1505,1506"

Answer 1

You can use BeanShell Postprocessor:

import java.util.regex.Matcher;
import java.util.regex.Pattern;
String response = prev.getResponseDataAsString();
String finalArr = "";
Pattern pattern = Pattern.compile("<input type=\"checkbox\" StudentID=\"(\\d+?)\"");
Matcher matcher = pattern.matcher(response);

while (matcher.find()) 
{
  finalArr = finalArr + matcher.group(1) + ",";
}

Or if you are using Regex Extractor then also in Beanshell Postprocessor:

Integer N = Integer.valueOf(vars.get("myTestVar _matchNr"));
String finalArr = "";

for(Integer i = 1; i <= N; i++)
{   
   finalArr = finalArr + (vars.get("myTestVar "+String.valueOf(i)+"_g1")) + ",";
}

Answer 2

IN this case it is better to use CSS/JQuery extractor instead of regexp extractor:

• CSS/JQuery expression : input

• Attribute : StudentID

• Reference : myId

Then you values would be in :

• myId_1
• myId_2 ...
• myId_N

And the number of references would be in :

• myId_matchNr

So to concatenate you can use Beanshell PostProcessor that will extract those, concat and store result in a new variables using:

vars.put("concat", )

Answer 3

Maybe late, but in 3.2+ you can put -1 in match number

br