fix: Replace \d with [0-9] in regexes to avoid sampling non-ascii digits

[delsner]

Motivation

Using \d in regular expressions for string columns results in non-ascii digits in sampled values. This is unexpected and breaks with the usual behavior of using \d as a metacharacter for ASCII digits only, i.e., [0-9].

Changes

• Sanitize regular expressions passed to sample() by replacing \d with [0-9]
• Add test cases for sampling ASCII digits for \d

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1049f81) to head (d898669).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #149   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           50        50           
  Lines         2901      2901           
=========================================
  Hits          2901      2901           

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[borchero]

Thanks!