String functions

The following string functions are implemented:

<CHR(x)> – returns the character for a specified ASCII value <x>.
<ORD(Str)> – returns the ordinal value of the first character of the string <Str>.
<LEN(Str)> – returns the length of the string <Str> (the number of characters in the string).
<POS(Pat, Str)> – returns the index of the first occurrence of the string <Pat> in the <Str> string. Returns 0 if the <Pat> string is not found in the <Str> string.
<NUM(Str)> – converts a string <Str> to a numeric representation; If the string is invalid, the functions returns 0.
<STR(n)> – converts number <n> into a string representation.
<COPY(Str, n, m)> – returns a substring of <Str> containing <m> characters and starting at index <n>.
<UPCASE(Str)> – returns a copy of the string <Str> in upper case.

<REPLACE(<string variable>, <looked string>, <string for replace>)> The replace statement of the substring in a string <REPLACE>.

Where:

<Str>, <Pat> – expressions that evaluate into a string value (variables, literal constants, functions or expressions);
<n>, <m> – numeric values.