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§ Right(string,number) returns the number rightmost characters of string.
§ RightB(string,number) works like Right, but number is taken to be a
number of bytes rather than characters.
§ Left(string,number), as you may guess, returns the number leftmost
characters of string.
§ LeftB(string,number) works like Left, but number is taken to be a
number of bytes rather than characters.
§ Mid(string,start,length) returns length characters from string,
starting at position start. When length is greater than the number of
characters left in the string, the rest of the string is returned. If length is not
specified, the rest of the string starting at the specified starting position is
returned.
§ MidB(string,start,length) works like Mid, but start and length are
both taken to be byte numbers rather than character numbers.
§ InStr(start,stringi,strlng2,comparetype) is used to check if and
where string2 occurs within string1. Start is an optional argument
that specifies where in string1 to start looking for string2.
comparetype is an optional argument that specifies which type of
comparison to perform. If comparetype is 0, a binary comparison is performed,
and uppercase letters are distinct from lowercase letters. If
comparetype is 1, a textual comparison is performed, and uppercase and
lowercase letters are the same. InStr returns zero if string1 is empty
(""), if string2 is not found in string1, or if start is greater than the
length of string2. It returns Null if either string is Null, It returns start
if string2 is empty. If string2 is successfully found in string1, it
returns the starting position where it is first found.
§ InStrB works like InStr except that the start position and return value
are byte positions, not character positions.
§ InStrRev(string1,string2,start,comparetype) starts looking for a
match at the right side of the string rather than the left side. start is by
default -1, which means to start at the end of the string.
§ Replace(string,find,replace,start,count,comparetype) is used to
replace occurrences of find with replace in string. start, count, and
comparetype are optional, but if you want to use one, you must use the
ones that come before it. start indicates where the resulting string will
start and where to start searching for find. It defaults to 1. count indicates
how many times to perform the replacement. By default, count is -1,
which means to replace every occurrence. If comparetype is 0, a binary
comparison is performed, and uppercase letters are distinct from lowercase
letters. If comparetype is 1, a textual comparison is performed, and
uppercase and lowercase letters are the same.
§ Filter(arrStrings,SearchFor,include,comparetype) searches an
array of strings, arrStrings, and returns a subset of the array, include is
a Boolean value. If include is True, Filter searches through all the
strings in arrStrings and returns an array containing the strings that
contain SearchFor. If include is False, Filter returns an array of the
strings that do not contain SearchFor. include is optional and defaults to

True. comparetype works the same as in the other string functions we
have discussed. If you want to use comparetype, you must use include.