#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WIN7)
// ntifs:FsRtlIsNameInExpression
NTSYSAPI
BOOLEAN
NTAPI
RtlIsNameInExpression(
_In_ PUNICODE_STRING Expression,
_In_ PUNICODE_STRING Name,
_In_ BOOLEAN IgnoreCase,
_In_opt_ PWCH UpcaseTable
);
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This function is documented in Windows SDK.