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I've seen several queries about 64 bit equivalents for the fast string routines in Win32. And I needed them myself as well. I have published (assembly based) functions that mimic system.Pos and sysUtils.StringReplace for 32 & 64 bit compiling (both String and AnsiString). Extra feature: searching can be case sensitive or case insensitive. Timing for string search (1k substrings in 1M string, microsec, see documentation; NextStrPos is new): mode 32 bit 64 bit search System.pos NextStrPos System.pos NextStrPos String 550 500 730 400 ANSIstring 530 460 3.500 360 Timing for String replace (1k substrings in 1M string, microsec, see documentation; StrReplace is new): mode 32 bit 64 bit replace SysUtils. StringReplace StrReplace SysUtils. StringReplace StrReplace String 6.500 1.050 6.000 1.050 ANSIstring 7.400 900 7.000 850 Files and documentation on https://sourceforge.net/projects/delphi-fast-pos-stringreplace/