fix(libsinsp): use correct regex for hex numbers

[therealbobo]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area API-version

/area build

/area CI

/area driver-kmod

/area driver-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-savefile

/area libscap

/area libpman

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

What this PR does / why we need it:

This just fixes the regex used to match hex numbers.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[github-actions]

Perf diff from master - unit tests

     2.05%     -0.87%  [.] sinsp::fetch_next_event
     3.43%     -0.72%  [.] sinsp_thread_manager::get_thread_ref
     5.48%     -0.71%  [.] sinsp_evt::get_type
     1.00%     +0.68%  [.] libsinsp::sinsp_suppress::process_event
     4.84%     -0.56%  [.] sinsp_parser::process_event
     0.79%     +0.54%  [.] libsinsp::events::is_unknown_event
     4.16%     +0.50%  [.] sinsp_evt::load_params
     1.42%     -0.50%  [.] sinsp_threadinfo::~sinsp_threadinfo
     2.90%     +0.50%  [.] gzfile_read
     0.53%     +0.39%  [.] std::vector<sinsp_evt_param, std::allocator<sinsp_evt_param> >::emplace_back<sinsp_evt*, unsigned int&, char const*, unsigned long&>

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            +0.0189         +0.0190           149           152           149           152
BM_sinsp_split_median                                          +0.0266         +0.0267           149           153           149           153
BM_sinsp_split_stddev                                          -0.0949         -0.0934             2             2             2             2
BM_sinsp_split_cv                                              -0.1117         -0.1103             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0412         -0.0411            59            57            59            57
BM_sinsp_concatenate_paths_relative_path_median                -0.0419         -0.0418            59            57            59            57
BM_sinsp_concatenate_paths_relative_path_stddev                +0.5799         +0.5776             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.6478         +0.6453             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0018         -0.0017            24            24            24            24
BM_sinsp_concatenate_paths_empty_path_median                   -0.0020         -0.0019            24            24            24            24
BM_sinsp_concatenate_paths_empty_path_stddev                   +0.3142         +0.3242             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       +0.3165         +0.3264             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0055         -0.0054            57            56            57            56
BM_sinsp_concatenate_paths_absolute_path_median                -0.0038         -0.0037            56            56            56            56
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.4299         -0.4301             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.4267         -0.4270             0             0             0             0
BM_sinsp_split_container_image_mean                            +0.0095         +0.0096           396           400           396           400
BM_sinsp_split_container_image_median                          +0.0098         +0.0099           396           400           396           400
BM_sinsp_split_container_image_stddev                          -0.3685         -0.3690             3             2             3             2
BM_sinsp_split_container_image_cv                              -0.3745         -0.3750             0             0             0             0

[FedeDP]

/cc @LucaGuerra
LGTM thanks for the fix!
/milestone 0.19.0

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 3ffbbca9fda048471178490b2002043a99b5149d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.46%. Comparing base (d8d345a) to head (6a25453).
Report is 27 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2132      +/-   ##
==========================================
+ Coverage   73.69%   74.46%   +0.76%     
==========================================
  Files         253      254       +1     
  Lines       31915    33333    +1418     
  Branches     5638     5733      +95     
==========================================
+ Hits        23521    24820    +1299     
- Misses       8394     8513     +119     

Flag	Coverage Δ
libsinsp	74.46% <ø> (+0.76%)	⬆️

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[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, therealbobo

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