RAD Studio VCL Reference
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Returns character index at which specified substring begins.
function Pos(const subStr: UnicodeString&): Integer;
__fastcall int Pos(const UnicodeString& subStr) const;
System::UnicodeString::Pos returns the character index in the System::UnicodeString instance at which the substring subStr begins, where 1 is the index of the first character, 2 is the index of the second character, and so on. If the substring is not contained in the System::UnicodeString, System::UnicodeString::Pos returns 0.
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