Programming exercises: Export files embedded with HTML syntax

[tobias-lippert]

Checklist

General

• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• I chose a title conforming to the naming conventions for pull requests.

Server

• Important: I implemented the changes with a very good performance and prevented too many (unnecessary) database calls.
• I followed the coding and design guidelines.
• I added multiple integration tests (Spring) related to the features (with a high test coverage).
• I documented the Java code using JavaDoc style.

Motivation and Context

The export of a programming exercise doesn't contain files embedded using HTML syntax because the regex doesn't match them.

Description

Added a second regex to also match files embedded with HTML syntax refactored some code to reuse logic for both regex expressions.

Steps for Testing

Prerequisites:

• 1 Instructor
• 1 Programming exercise

1. Embedded some files in the problem statement using both markdown and html syntax
2. Export (Download) the exercise
3. Verify that the export contains all embedded files.

Review Progress

Performance Review

• I (as a reviewer) confirm that the server changes (in particular related to database calls) are implemented with a very good performance

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Test Coverage

Server

Class/File	Line Coverage	Confirmation (assert/expect)	Comment
ProgrammingExerciseExportService.java	86%	✅	my changes are covered

Screenshots

[JohannesStoehr]

Code looks good to me now

[MaximilianAnzinger]

Code LGTM
Tested on TS2, works

[dearjasmina]

tested in the testing session, works as described

[laurenzfb]

Tested in testing session. Worked as expected!

[Strohgelaender]

tested in testing session, works as expected.