feat: improve username sanitization in profiling example

[Dongnyoung]

Hello,

This commit updates the username sanitization logic in the profiling
example code to allow only alphanumeric characters. The original
pattern (/[!@#$%^&*]/g) was limited and could lead to inconsistent
behavior depending on input.

Changed:

• From: username = username.replace(/[!@#$%^&*]/g, '');
• To: username = username.replace(/[^a-zA-Z0-9]/g, '');

This change makes the input handling cleaner and more appropriate
for educational purposes, aligning better with common sanitization
practices.

Note: This change was initially merged into my forked repository by mistake during development. This PR now reflects the correct version intended for the original repository.

Relates to: #7867

Thank you for reviewing.

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[AugustinMauroy]

In theory it's good. But I don't know what is the value behind this example

[Dongnyoung]

Thanks for the feedback!

I suggested this change to make the example more aligned with common input sanitization practices. The original regex was quite limited, so I thought a more realistic pattern might help learners better understand typical use cases.

Happy to adjust further if needed!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.46%. Comparing base (1ccf19c) to head (a3e1ef3).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7868   +/-   ##
=======================================
  Coverage   75.46%   75.46%           
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  Files         101      101           
  Lines        8306     8306           
  Branches      218      218           
=======================================
  Hits         6268     6268           
  Misses       2036     2036           
  Partials        2        2           

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