ObjectPascal StrScan Function Searches for a specific character in a constant string SysUtils unit

function StrScan ( const Characters : PAnsiChar; SearchChar : Char ) : PAnsiChar;

Description StrScan is used when you need to check a single character against a list of known characters (Characters).   If the SearchChar exists in Characters, then a pointer to the position in Characters is returned.   If it does not exist, a nil pointer is returned. Related commands AnsiPos Find the position of one string in another AnsiIndexStr Compares a string with a list of strings - returns match index AnsiMatchStr Returns true if a string exactly matches one of a list of strings LastDelimiter Find the last position of selected characters in a string		Example code : A simple example const   Numbers = '0123456789'; begin   if StrScan(Numbers, '2') <> nil   then WriteLn('2 is a numeric digit')   else WriteLn('2 is not a numeric digit');   if StrScan(Numbers, 'A') <> nil   then WriteLn('A is a numeric digit')   else WriteLn('A is not a numeric digit'); end; Show full unit code    2 is a numeric digit    A is not a numeric digit