#### Macro for detect palindromes and repeats in letters/numbers string

```Dear all,
I am looking to detect palindromes (sentence or number or other
sequence of units that can be read the same way in either direction)
and repeats (sequences of letters or numbers which are repeating
atleast twice within a string) in some strings containing between
20-5000 letters. Has somebody any idea how could I perform that using
an Excel macro? I would like that the string to be evaluated could be
on cell "A1" and that the detected palindromes and repeats could be
listed bellow A2 and C2, respectively; and that the number of times
that they appear in the sentence could be listed bellow cells B2 and
D2, respectively, as the following small example:

QGAGGAAGGAGQ
Palindromes	        Number		Repeats		Number
QGAGGAAGGAGQ	1		        GA		        3
GAG		                2		        AG		        3
GG		                2		        GAG		        2
AA		                1		        AA		        1
GG		        2

Somebody could help me?
Luciano
```
 0
4/14/2009 2:55:28 PM
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```One of the first UDF's I wrote beack in 2005 was a palindrome checker.
Could probably write it a little better now, but I wrote it to try to
understand how to write a UDF

Could be a start for you.

Good luck

Noz

Function IsPalindrome(Selection) As Boolean
'Returns True if cell is a palindrome

'Declarations
Dim MyStringBefore As String
Dim MyStringInProgress As String
Dim MyStringReversed As String
Dim CharacterToCheck As String
Dim i As Integer

'Check whether a range has been selected
If TypeName(Selection) <> "Range" Then Exit Function
MyStringBefore = UCase(Selection.Value)

'strip out any non-letters
For i = 1 To Len(MyStringBefore)

CharacterToCheck = Mid(MyStringBefore, i, 1)
If Asc(CharacterToCheck) >= 65 And Asc(CharacterToCheck) <= 90
Then
'found letter that is A-Z
MyStringInProgress = MyStringInProgress & CharacterToCheck
End If

Next i

'Mystringinprogress is now simply uppercase A-Z's with no spaces.

For i = Len(MyStringInProgress) To 1 Step -1
MyStringReversed = MyStringReversed & Mid(MyStringInProgress,
i, 1)
Next i

If MyStringReversed = MyStringInProgress Then
IsPalindrome = True
Else
IsPalindrome = False
End If

End Function
```
 0
4/14/2009 4:29:29 PM
```On 14 abr, 11:55, Luciano Paulino da Silva
<lucianopaulinosi...@gmail.com> wrote:
> Dear all,
> I am looking to detect palindromes (sentence or number or other
> sequence of units that can be read the same way in either direction)
> and repeats (sequences of letters or numbers which are repeating
> atleast twice within a string) in some strings containing between
> 20-5000 letters. Has somebody any idea how could I perform that using
> an Excel macro? I would like that the string to be evaluated could be
> on cell "A1" and that the detected palindromes and repeats could be
> listed bellow A2 and C2, respectively; and that the number of times
> that they appear in the sentence could be listed bellow cells B2 and
> D2, respectively, as the following small example:
>
> QGAGGAAGGAGQ
> Palindromes =A0 =A0 =A0 =A0 =A0 =A0 Number =A0 =A0 =A0 =A0 =A0Repeats =A0=
=A0 =A0 =A0 Number
> QGAGGAAGGAGQ =A0 =A01 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 GA =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A03
> GAG =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 2 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 AG =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A03
> GG =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A02 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 GAG =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 2
> AA =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A01 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 AA =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A01
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 GG =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A02
>
> Somebody could help me?
> Luciano

correction:

QGAGGAAGGAGQ
Palindromes	Number		Repeats		Number
QGAGGAAGGAGQ	1		GA		3
GGAAGG		1		GG		2
GAAG		1		AG		3
GAG		2		GAG		2
GG		2
AA		1
```
 0
4/14/2009 4:31:10 PM
```Thank you Noz!
I will try!
Luciano

On 14 abr, 13:29, Nozza <nozza_again_...@yahoo.co.uk> wrote:
> One of the first UDF's I wrote beack in 2005 was a palindrome checker.
> Could probably write it a little better now, but I wrote it to try to
> understand how to write a UDF
>
> Could be a start for you.
>
> Good luck
>
> Noz
>
> Function IsPalindrome(Selection) As Boolean
> 'Returns True if cell is a palindrome
>
> =A0 =A0 'Declarations
> =A0 =A0 Dim MyStringBefore As String
> =A0 =A0 Dim MyStringInProgress As String
> =A0 =A0 Dim MyStringReversed As String
> =A0 =A0 Dim CharacterToCheck As String
> =A0 =A0 Dim i As Integer
>
> =A0 =A0 'Check whether a range has been selected
> =A0 =A0 If TypeName(Selection) <> "Range" Then Exit Function
> =A0 =A0 MyStringBefore =3D UCase(Selection.Value)
>
> =A0 =A0 'strip out any non-letters
> =A0 =A0 For i =3D 1 To Len(MyStringBefore)
>
> =A0 =A0 =A0 =A0 CharacterToCheck =3D Mid(MyStringBefore, i, 1)
> =A0 =A0 =A0 =A0 If Asc(CharacterToCheck) >=3D 65 And Asc(CharacterToCheck=
) <=3D 90
> Then
> =A0 =A0 =A0 =A0 =A0 =A0 'found letter that is A-Z
> =A0 =A0 =A0 =A0 =A0 =A0 MyStringInProgress =3D MyStringInProgress & Chara=
cterToCheck
> =A0 =A0 =A0 =A0 End If
>
> =A0 =A0 Next i
>
> =A0 =A0 'Mystringinprogress is now simply uppercase A-Z's with no spaces.
>
> =A0 =A0 For i =3D Len(MyStringInProgress) To 1 Step -1
> =A0 =A0 =A0 =A0 MyStringReversed =3D MyStringReversed & Mid(MyStringInPro=
gress,
> i, 1)
> =A0 =A0 Next i
>
> =A0 =A0 If MyStringReversed =3D MyStringInProgress Then
> =A0 =A0 =A0 =A0 IsPalindrome =3D True
> =A0 =A0 Else
> =A0 =A0 =A0 =A0 IsPalindrome =3D False
> =A0 =A0 End If
>
> End Function

```
 0
4/14/2009 5:16:07 PM

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