Commonly Used Routines for Null-terminated Strings

The null-terminated string handling routines cover several functional areas. Within these areas, some are used for the same purpose, the differences being whether or not they use a particular criteria in their calculations. The following tables list these routines by these functional areas:

Comparison
Case conversion
Modification
Sub-string
Copying

Where appropriate, the tables also provide columns indicating whether the routine is case-sensitive, uses the current locale, and/or supports multi-byte character sets.

Null-terminated string comparison routines

Routine	Case-sensitive	Uses locale settings	Supports MBCS
SysUtils.AnsiStrComp	yes	yes	yes
SysUtils.AnsiStrIComp	no	yes	yes
SysUtils.AnsiStrLComp	yes	yes	yes
SysUtils.AnsiStrLIComp	no	yes	yes
SysUtils.StrComp	yes	no	no
SysUtils.StrIComp	no	no	no
SysUtils.StrLComp	yes	no	no
SysUtils.StrLIComp	no	no	no

Null-terminated case conversion routines

Routine	Uses locale settings	Supports MBCS
SysUtils.AnsiStrLower	yes	yes
SysUtils.AnsiStrUpper	yes	yes
SysUtils.StrLower	no	no
SysUtils.StrUpper	no	no

String modification routines

Routine

SysUtils.StrCat

SysUtils.StrLCat

Sub-string routines

Routine	Case-sensitive	Supports MBCS
SysUtils.AnsiStrPos	yes	yes
SysUtils.AnsiStrScan	yes	yes
SysUtils.AnsiStrRScan	yes	yes
SysUtils.StrPos	yes	no
SysUtils.StrScan	yes	no
SysUtils.StrRScan	yes	no

Null-terminated string copying

Routine