Revert "Update regexes to accept valid name/group strings"

[Ragnapop]

Reverts #231

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.12%. Comparing base (2c7215a) to head (8e3659b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #242   +/-   ##
=========================================
  Coverage     75.12%   75.12%           
  Complexity      602      602           
=========================================
  Files            88       88           
  Lines          1946     1946           
  Branches        210      210           
=========================================
  Hits           1462     1462           
  Misses          416      416           
  Partials         68       68           

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[hjuntan]

Remove change in validation regex in name and group due to violation in feature freeze. The original validation regex in group name is "[\p{Alnum}][\p{Alnum} ]*" and requires in more revert.