Regular Expression If 2nd parameter is Enrollment - regex

Question

I have below response
{
"id": "3452",
"enrollable_id": "3452",
"enrollable_type": "Enrollment"
}
{
"id": "3453",
"enrollable_id": "3453",
"enrollable_type": "Task"
}
{
"id": "3454",
"enrollable_id": "3454",
"enrollable_type": "Enrollment"
}
{
"id": "3455",
"enrollable_id": "3455",
"enrollable_type": "Task"
}
I would like to get id [3452 and 3454] only if enrollable_type= Enrollment. This is for jmeter regex extractor so it would be great if I can just use one liner regex to fetch 3452 and 3454.

Answer 1

The RegEx you are looking for is:
_id":\s*"([^"]+(?=[^\0}]+_type":\s*"E))
Try it online!
Explanation
_id":\s*" Finds the place where the enrollment_id is
[^"]+(?= Matches the ID if:
[^\0}]+_type":\s* Finds the place where enrollable_type is
"E Checks if the enrollable type begins with an uppercase E
) End if
( ) Captures the ID
It's important to note that this RegEx will match on valid people and capture the valid ID. This means you will need to get each match's capture rather than just getting each match.
Disclaimer
The above RegEx contains backslashes, which you will need to escape if using the RegEx as a string literal.
This is the RegEx with all necessary-to-escape characters escaped:
_id":\\s*"([^"]+(?=[^\\0}]+_type":\\s*"E))

Answer 2

It's usually a bad idea to parse structured data with just a regex, but if you're intent on going this route then here you go:
"(\d+)"\s*,\s*(?="enrollable_type":\s*"Enrollment")
This assumes that entrollable_type always follows enrollable_id and that everything is quoted consistently with a little allowance for variance in white space. You should be able to handle a little more variance if necessary, such as if you're unsure if can depend on keys or data being quoted (["']?). However, if you can depend on the order of the properties (such as if they type comes before id) then you should abandon using a regex.
Here's a sample working in JavaScript
const text = `{ "id": "3452", "enrollable_id": "3452", "enrollable_type": "Enrollment" } { "id": "3453", "enrollable_id": "3453", "enrollable_type": "Task" } { "id": "3454", "enrollable_id": "3454", "enrollable_type": "Enrollment" } { "id": "3455", "enrollable_id": "3455", "enrollable_type": "Task" }`;
const re = /"(\d+)"\s*,\s*(?="enrollable_type":\s*"Enrollment")/g;
var match;
while(match = re.exec(text)) {
console.log(match[1]);
}

Answer 3

Your response seems to be a JSON one (however it's malformed). If this is the case and it's really JSON - I would recommend going for JSON Extractor instead as regular expressions are fragile, sensitive to markup change, new lines, order of elements, etc. while JSON Extractor looks only into the content.
The relevant JSON Path query would be something like:
$..[?(#.enrollable_type == 'Enrollment')].enrollable_id
Demo:
More information: JMeter's JSON Path Extractor Plugin - Advanced Usage Scenarios

Answer 4

You can extract the data in 2 ways
Using Json Extractor.
To extract data using json extractor response data should follow json syntax rules,
To extract data use the following JSON path in json extractor
$..[?(#.enrollable_type=="Enrollment")].id
and use match no -1 as shown below
To extract data using regular expression extractor use the following regex
id": "(.+?)",\s*(.+?)\s*"enrollable_type": "Enrollment
template : $1$2$3$4$
Match no -1
as shown below
you can see the variables stored using debug sampler
More information
extract variables