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?

From the help you are referring to: This function is case-sensitive. — LU RD
– LU RD, Commented May 12, 2015 at 5:01
@LU RD, I was sure that help page did not mention it when I've posted the question! Just to confirm if I was not mistaken, I've checked my TimeSnapper screenshots and yes, at 11:53 Sydney time the page did not mention the case-sensitivity :-) See imgur.com/ljMSt8m I see at the bottom of the mentioned help page "This page was last modified on 11 May 2015, at 19:40" so someone must have updated a short while ago :-) imgur.com/ny7NRM1 XE7 and earlier was not updated... docwiki.embarcadero.com/Libraries/XE7/en/… — Kobus Smit
– Kobus Smit, Commented May 12, 2015 at 5:30
User "Adap krw" has updated that page. Change history: docwiki.embarcadero.com/Libraries/XE8/e/… — Kobus Smit
– Kobus Smit, Commented May 12, 2015 at 5:35
Wow, someone is actually updating the docs, and seems to be reacting on SO posts :-) — LU RD
– LU RD, Commented May 12, 2015 at 5:48

Kobus Smit · Accepted Answer · 2015-05-12 02:16:41Z

Yes it is case sensitive.

Quick test:

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

returns False

Use ToLowerInvariant or ToUpperInvariant to compare case insensitive:

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

Invariant casing is just one way. Perhaps locale sensitive would be needed for some applications.

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