jjohn

Unique characters to array

5 posts in this topic

#1 ·  Posted

Hi all,

I have the following code, basically, it populates an array with unique characters found in a string, but it turns out only one character is in the array, i don't want to think it is due to a bug of autoit at this point, so i need your help on why, please:sweating:

Dim $sx[0]
Dim $cn
$ss = "Xx"
ConsoleWrite(StringLeft($ss, 1) & " " & StringRight($ss, 1) & @CRLF)
ConsoleWrite(StringLeft($ss, 1) = StringRight($ss, 1) & @CRLF) ;here show X <> x
ConsoleWrite(@CRLF)
;the following is to populate array $sx with different unique characters in $ss
For $b = 1 To StringLen($ss)
    $flg = 0
    For $a = 0 To UBound($sx) - 1
        ;if asc(StringMid($ss,$b,1)) = asc($sx[$a]) Then ;if this line is used instead of the next, everything is fine
        If StringMid($ss, $b, 1) = $sx[$a] Then
            If StringMid($ss, $b, 1) = "x" Then ConsoleWrite("<<->>" & StringMid($ss, $b, 1) & " " & $sx[$a] & @CRLF)
            $flg = 1
            ExitLoop
        EndIf
    Next
    If $flg = 0 Then
        $cn = $cn + 1
        ReDim $sx[$cn]
        $sx[$cn - 1] = StringMid($ss, $b, 1)
    EndIf

Next
ConsoleWrite(UBound($sx) & @CRLF);list the ubound of $sx
;list what is in array $sx
For $a = 0 To UBound($sx) - 1
    ConsoleWrite($sx[$a] & @CRLF)
Next

same code in a file is attached as uniqueChar2Array.au3

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#2 ·  Posted

When applied to strings, = performs a case-insensitive comparison. Use == instead.

 

1 person likes this

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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#3 ·  Posted

In the string provided, "Xx" there is only one unique character. Try using StringInStr or StringRegExp to match by case as well.

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#4 ·  Posted

Wow, you guys are fast, i learn more today, thanks!

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#5 ·  Posted (edited)

You can also retrieve all uniq characters using a regex :

#Include <Array.au3>

Local $sString = "This is a complex String"

Local $aUniqChars = StringRegExp($sString, "(.)(?!.*\1)", 3)
ConsoleWrite(UBound($aUniqChars) & " uniq characters found : " & @CRLF)
For $i = 0 To UBound($aUniqChars) - 1
    ConsoleWrite( " " & $aUniqChars[$i] & @CRLF)
Next

or with other basic functions :

#include <StringConstants.au3>
#Include <Array.au3>

Local $sString = "This is a complex String"

Local $aChars = StringSplit($sString, "", $STR_NOCOUNT)
$aUniqChars = _ArrayUnique($aChars)
_ArrayDisplay($aUniqChars)

 

Edited by jguinch

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