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Besides from the regular + and - operators, there is a bunch of functions that you can use to manipulate strings.
function len(txt$)
function lower$(txt$)
function upper$(txt$)
function left$(txt$, n)
function right$(txt$, n)
function mid$(txt$, pos)
function mid$(txt$, pos, n)
function instr(txt$, sub$)
function instr(txt$, sub$, pos)
function split$[](txt$, c$)
Return the character length of txt.
Return txt will all letters converted to lower case.
Return txt with all letters converted to upper case.
Return the n leftmost characters of txt.
Return the characters right of position n in txt (the oposite of left$).
Return the character at position pos in txt.
Return n characters starting at position pos in txt.
Return the position of the first occurrence of sub in txt. -1 is returned if txt doesn't contain sub.
Same as above but start searching at position pos.
Split txt at every occurence of the character c and return the result as an array of strings.
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