string between question

[danpaul23]

I'm trying to use the _StringBetween function but I would like to start the search from what would normally be the end and search backwards in the string to what would normally be the start.

I need to do this without using the _StringReverse function.

Thanks,

Dan

[_Kurt]

I can't understand why you wouldn't use _StringReverse. It would work perfectly if you stringbetween it and reverse. I don't think I know another way

Edited January 19, 2007 by _Kurt

[danpaul23]

I can't understand why you wouldn't use _StringReverse. It would work perfectly if you stringbetween it and reverse. I don't think I know another way

Because it's searching the HTML source for a large page.

[_Kurt]

Well, do you want to read the WORDS backwards? or each letter backwards?

example: hello this is a test

returns: test a is this hello

[SuperMcFlourish]

Well, do you want to read the WORDS backwards? or each letter backwards?

example: hello this is a test

returns: test a is this hello

hey i dont understand, how can you read each letter backwords? :">

[danpaul23]

Well, do you want to read the WORDS backwards? or each letter backwards?

example: hello this is a test

returns: test a is this hello

I assume that if it was possible to do a reverse search I would have to reverse the strings which represented the "start" and "end" points of the backward search and that the string I would get would also be reversed (letter by letter).

So, I guess, I would want it to read the letters backwards, since then I could easily reverse the string and get the results I wanted.

I think I may have figured out a bit of a sloppy way to get around having to do this but it would be easier and cleaner to just be able to search backwards.

Thanks.

[_Kurt]

A sloppy way would perhaps look something like this (this is just a small example):

SNIPPED, see post below

I'm not 100% sure that could work, but I bet something like that would.

Hope that helps,

Kurt

EDIT: minor mistake

Edited January 19, 2007 by _Kurt

[SuperMcFlourish]

A sloppy way would perhaps look something like this (this is just a small example):

Local $string = ""
$len = StringLen($yourstring)
For $i = 1 To $len
   $string = $string & StringTrimLeft($yourstring, $len+$i)
Next
Msgbox(0,"","This a small attempt to reverse the letters in your string:" & @CRLF & $string)

I'm not 100% sure that could work, but I bet something like that would.

Hope that helps,

Kurt

it doesn't but i see what you mean. hehe

[danpaul23]

A sloppy way would perhaps look something like this (this is just a small example):

Local $string = ""
$len = StringLen($yourstring)
For $i = 1 To $len
   $string = $string & StringTrimLeft($yourstring, $len-$i)
Next
Msgbox(0,"","This a small attempt to reverse the letters in your string:" & @CRLF & $string)

I'm not 100% sure that could work, but I bet something like that would.

Hope that helps,

Kurt

EDIT: minor mistake

I'll have to look at it more closely later (I've got one foot out the door.) but I think it won't work since prior to completing the _stringbetween function, the size of the string is not known.

It has got me thinking about some other options I could maybe use however and as I said, if all else fails, I think I have another sloppy solution that will at least work.

Thanks again.

[_Kurt]

I've got it!!!

Local $string = "", $yourstring = "tset a si siht"
$len = StringLen($yourstring)
For $i = 1 To $len
   $trimleft = StringTrimLeft($yourstring, $len-$i)
   $trimright= StringTrimRight($trimleft, $i-1)
   $string = $string & $trimright
Next
Msgbox(0,"","This a small attempt to reverse the letters in your string:" & @CRLF & $string)

EDIT: it also works at VERY fast speed -- the Msgbox is " this is a test "

Edited January 19, 2007 by _Kurt

[SuperMcFlourish]

I've got it!!!

Local $string = "", $yourstring = "tset a si siht"
$len = StringLen($yourstring)
For $i = 1 To $len
   $trimleft = StringTrimLeft($yourstring, $len-$i)
   $trimright= StringTrimRight($trimleft, $i-1)
   $string = $string & $trimright
Next
Msgbox(0,"","This a small attempt to reverse the letters in your string:" & @CRLF & $string)

EDIT: it also works at VERY fast speed -- the Msgbox is " this is a test "

nice job!

[xcal]

Why without _StringReverse?

#include <string.au3>
$yourstring = "tset a si siht"
$new_string = _StringReverse($yourstring)
MsgBox(0, '', $new_string)

Edited January 19, 2007 by xcal

[_Kurt]

Yes, we know xcal. I've got no clue why danpaul doesn't use _StringReverse() but it's up to him. And my way works perfectly, and at a fast speed

[xcal]

I realize that... I just thought it was odd to request a resolution to something that already has a resolution.

MsgBox(0, '', _StringReverse('tset a si siht'))

;right out of string.au3
Func _StringReverse($sString)
    Local $sReverse
    Local $iCount
    If StringLen($sString) >= 1 Then
        For $iCount = 1 To StringLen($sString)
            $sReverse = StringMid($sString, $iCount, 1) & $sReverse
        Next
        Return $sReverse
    Else
        SetError(1)
        Return ""
    EndIf
EndFunc

Edited January 19, 2007 by xcal

[_Kurt]

Lol, that is true. It's basically the same thing, oh well.

Kurt

PS: i like your new pic, xcal

[danpaul23]

I've got it!!!

Local $string = "", $yourstring = "tset a si siht"
$len = StringLen($yourstring)
For $i = 1 To $len
   $trimleft = StringTrimLeft($yourstring, $len-$i)
   $trimright= StringTrimRight($trimleft, $i-1)
   $string = $string & $trimright
Next
Msgbox(0,"","This a small attempt to reverse the letters in your string:" & @CRLF & $string)

EDIT: it also works at VERY fast speed -- the Msgbox is " this is a test "

Thanks for working on this and the interesting solution however, it's not what I'm looking for. Basically I have a large source that I'm searching that looks something like this.

...............<A>.............<A>..............<A>.........(unknown size and content)..............<B>...................<A>

I need the string between the third <A> and the <B>. <B> is a unique expression which I know. I also know <A> but it is a common expression which occurs a lot through the document so I don't want to search for the string between <A> and <B> because it returns all the <A> to <B> strings from the start of the document. I don't want to use string reverse for the entire file because it seems to take a long, long time to do so (it's a large file).

If I could search from the <B> backwards to the third <A>, it would be an easy solution.

I think my imperfect solution is going to be to search for the string from <A> to <B> then sort the array which is created from the <A> to <B> string search so that the smallest string is on top, then use that.

I was also thinking that if I could extract the charecters one at a time from the left of expression <B> to create a string, I would eventually be able to "find" <A> and then reverse the string generated (hope that makes sense). But I'm not sure if that would be any more efficient than just generating and sorting a big array of strings.

I've only been writing code for about a week so I might be missing something obvious or have entirely misunderstood something. Sorry if that's the case.

Thanks again.

[danpaul23]

Thanks for working on this and the interesting solution however, it's not what I'm looking for. Basically I have a large source that I'm searching that looks something like this.

...............<A>.............<A>..............<A>.........(unknown size and content)..............<B>...................<A>

I need the string between the third <A> and the <B>. <B> is a unique expression which I know. I also know <A> but it is a common expression which occurs a lot through the document so I don't want to search for the string between <A> and <B> because it returns all the <A> to <B> strings from the start of the document. I don't want to use string reverse for the entire file because it seems to take a long, long time to do so (it's a large file).

If I could search from the <B> backwards to the third <A>, it would be an easy solution.

I think my imperfect solution is going to be to search for the string from <A> to <B> then sort the array which is created from the <A> to <B> string search so that the smallest string is on top, then use that.

I was also thinking that if I could extract the charecters one at a time from the left of expression <B> to create a string, I would eventually be able to "find" <A> and then reverse the string generated (hope that makes sense). But I'm not sure if that would be any more efficient than just generating and sorting a big array of strings.

I've only been writing code for about a week so I might be missing something obvious or have entirely misunderstood something. Sorry if that's the case.

Thanks again.

I actually found a pretty simple solution and thought I'd post it in case anyone in the future is trying to figure out the same thing. There are probably better ways to write it but this should at least demonstrate the idea.

CODE

$VarA = 0

$days = StringSplit("Sun,Mon,Tue,Wed,Thu,Fri,Sat", "Thu", 1)

$String2 = string($days[1])

While 1

$VarA = $VarA + 1

$String3 = StringRight ($String2, $VarA)

$result = STringInStr($String3, "Sun")

if not ($result = 0) Then

exitloop

EndIf

WEnd

MsgBox(0,"", "your string, sir: " & $String3)