Is the “Contains” Delphi string helper case sensitive?

Question

Delphi XE3 introduced a Contains string helper function, but the help-file/wiki does not state whether it is case sensitive or not?

Answer 1

Yes it is case sensitive.

Quick test:

ShowMessage('TEST'.Contains('t').ToString(TUseBoolStrs.True));

returns False

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Use ToLowerInvariant or ToUpperInvariant to compare case insensitive:

ShowMessage('TEST'.ToLowerInvariant.Contains('t').ToString(TUseBoolStrs.True));