How to "subtract strings"?

[asgarcymed]

The mathematical operators are easy to use and everybody knows:

$a=10

$b=1

$a + $b = 11

$a - $b = 9

However, if variables are strings rather than numbers, sometimes is confusing...

$a = "AAAAAAAZZZZZZZZZZZZZZZ"

$b = "ZZZZZZZZZZZZZZZ"

$a & $b (the correct; not $a + $b because no numbers!) = "AAAAAAAZZZZZZZZZZZZZZZAAAAAAAZZZZZZZZZZZZZZZ"

My question is -How to subtract characters using string variables?:

«$a -$b» = "AAAAAAA" (what is the correct expression, instead of «$a -$b»?)

Regards.

[BrettF]

Maybe...

MsgBox (0, "", _StringLikeMath ("aaaaaaaaaaaaaaaaxxxxxxxxxxxxxxxx", "*", 10))

Func _StringLikeMath ($a, $op, $b)
    Local $ret
    If $op = "-" Then
        $ret = StringReplace ($a, $b, "", 1, 1)
    ElseIf $op = "+" Then
        $ret = $a & $b
    ElseIf $op = "*" Then
        For $i = 1 to $b
            $ret &= $a
        Next
    ElseIf $op = "/" Then
        $ret = "Not sure what to do... ERROR! EEP! =P"
    EndIf
    Return $ret
EndFunc

Edited October 6, 2007 by Bert

[asgarcymed]

Thanks!

[BrettF]

Thanks!

Just use the part you need in the actual function I created... The rest was a bit of fun, so you could get the general idea

[asgarcymed]

Your code made me to learn what I was looking for and much more! A big thank you!