char 3 to 1 of myValue -- won't work 

-- end cannot be greater than start

​

char -1 to -4 of myValue -- won't work

-- 4th from last comes before last

get char 1 to 3 of "ABCD" -- yields "ABC"

get segment 2 to -1 of myValue -- second segment to last segment

put it into line 7 to 21 of myValue -- replaces

the number of lines in myVariable

the number of chars of item 10 of myVariable

"A" is in "ABC" -- evaluates to true

"123" is in "13" -- evaluates to false

"A" is in item 1 of "A,B,C" -- evaluates to true

"123" is in segment 2 of "123 456 789" -- evaluates to false