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Draft: Example HLT han config with regexes (bjet)

Elin Bergeaas Kuutmann requested to merge ebergeas/athena:master-hlt-regexes-hanconfig into master

I try to implement regexes for the han config ( see https://gitlab.cern.ch/atlas/athena/-/blob/master/DataQuality/DataQualityInterfaces/share/histogramAnalysisRegex.config ) in an HLT setting using bjets as an example. The attached changes in HLT/HLTbjets show a minimal example. The bjets signature HIST file follows this structure:
All histograms are placed in one of the subfolders Shifter, Expert or Offline. In Shifter and Expert, the structure is the following:

HLT_chain1
   hist1_HLT_chain1
   hist2_HLT_chain1
   :
HLT_chain2
   hist1_HLT_chain2
   hist2_HLT_chain2
   :

i.e. there are many subfolders with different names based on their chain names. Under each chain subfolder there are the same sets of histograms, but suffixed with the chain name.

When I run this, I get no compilation warning, but a segmentation violation, see the attached files: error2_minimal.txt (error message) mylog.txt(log file).

To reproduce, check out my code, compile and run
DQWebDisplay.py data18_13TeV.00310000.physics_Main.HIST.d220228.root TestDisplay 123 0 stream=physics_Main> mylog.txt &

The input root file can be found here:
/afs/cern.ch/user/e/ebergeas/work/public/triggermonitoring/hanMar2022/data18_13TeV.00310000.physics_Main.HIST.d220228.root
The root file comes from the nightly test
x86_64-centos7-gcc11-opt/2022-02-28T2101/TrigAnalysisTest/test_trigAna_RDOtoRun3DQ_v1Dev_grid/
where the file is called ExampleMonitorOutput.root (no longer available in eos, but any recent nightly should also work).

CC: @ponyisi @astruebi @palacino

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