Match No differs in Boundary & RegExp Post-Processors

[d1ckb31n]

Expected behavior

Match should be 1 if field Match No. is not set (empty). Documentation lacks an entry for empty field at all. Only 0 and nth match is described.

Actual behavior

RegExp Extractor uses the first match whereas Boundary Extractor uses a random match in case the match no is empty.
Both should behave identical/consistent.

Steps to reproduce the problem

Add a regexp extractor and a boundary extractor to the testplan. Extract the same value using both post-processors. Display the result via Debug pre-processor

JMeter Version

5.6.3

Java Version

openjdk version "21.0.2" 2024-01-16 LTS

OS Version

Microsoft Windows [Version 10.0.19045.5011]