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VBA Check for Character

Posted on 2016-07-21
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Last Modified: 2016-07-21
I would like to check with a function whether a string contains a character from a-z.
As you can see, I use the LIKE operator. The problem is that sometimes the function works, sometimes it doesn't

When I check for the following value, the function returns FALSE, instead of TRUE: 15.fdas45.fsda

Any ideas what I'm doing wrong?

Function CheckForLetter(strSearch As String) As Boolean

    Dim intPosition As Long
    CheckForLetter = True

    For intPos = 1 To Len(strSearch)
        CheckForLetter = (Mid$(strSearch, intPosition, 1) Like "[a-zA-Z]")
        If Not CheckForLetter Then
        Exit For
        Exit Function
    Next intPosition

End Function

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Comment
Question by:Massimo Scola
9 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 41723038
your function returns false on the first character that is not a-z...
reverse tge logic, hence
0
 
LVL 33

Assisted Solution

by:Rob Henson
Rob Henson earned 50 total points
ID: 41723042
How about checking the ASCII Chr value of the character?

A to Z = 65 to 90
a to z = 97 to 122
0
 
LVL 30

Accepted Solution

by:
Subodh Tiwari (Neeraj) earned 450 total points
ID: 41723053
It should be like this.....

Function CheckForLetter(strSearch As String) As Boolean
Dim intPosition As Long
For intPosition = 1 To Len(strSearch)
   CheckForLetter = (Mid$(strSearch, intPosition, 1) Like "[a-zA-Z]")
   If CheckForLetter Then Exit For
Next intPosition
End Function

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Author Closing Comment

by:Massimo Scola
ID: 41723070
Neerja's solution worked best for me.

Thanks for your help!
0
 
LVL 30

Expert Comment

by:Subodh Tiwari (Neeraj)
ID: 41723074
You're welcome. Glad we could help.
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 41723086
Sure. It does exactly what i wrote...
Relaxing on tbe beach i didn't want to write out the actual code ( trying to make people yealous ;-)
0
 
LVL 30

Expert Comment

by:Subodh Tiwari (Neeraj)
ID: 41723108
Also I think it's best to check if a letter exists in a string at once instead of looping through each character in string.

Alternatively you may also use the following function. See if that helps...

Function CheckForLetter(strSearch As String) As Boolean
Dim RE As Object
Set RE = CreateObject("vbscript.regexp")
With RE
   .IgnoreCase = True
   .Pattern = "[A-Z]"
End With
CheckForLetter = RE.Test(strSearch)
End Function

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 41723131
would this not work much faster

if yourstring like "*[a-zA-Z]*" then checkexistance = true
1
 
LVL 30

Expert Comment

by:Subodh Tiwari (Neeraj)
ID: 41723155
Wonderful! This shows why you are the Top Expert In EE. :)

CheckForLetter = strSearch Like "*[a-zA-Z]*"

Also no need for function as one single line can be used in the code itself like

IF strSearch Like "*[a-zA-Z]*" Then
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