Fix: Use strpos

[localheinz]

This pull request

• uses strpos

[codecov]

Codecov Report

Merging #582 (107d8e3) into main (e4dc894) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #582   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         7         7           
===========================================
  Files              2         2           
  Lines             20        20           
===========================================
  Hits              20        20           

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