How can i check for character , number and special characters in a string?
I want to user to enter only numbers and characters in textbox i.e no special charaters. I don't want to use key press event of textbox.
As i need same开发者_开发问答 validation in gridview.
So i want to validate whole string.
Thanks in advance.
Using the Regex class for regular expressions you can use:
If Regex.IsMatch(myString, "^[A-Za-z0-9]+$") Then
'Do stuff
End If
EDIT: I forgot to add the ^
and the $
to denote that the match should go from start to finish on the string. You'll also need to put a \s
in there if whitespace is allowed.
You can parse the string and then check the ascii values to make sure they are only Alpha-numeric. Here's some pseudocode:
StrLength = Len(Text)
For x = 1 To StrLength
sChar = Mid$(Text, x, 1)'Gets the x'th charcter in Text
bASCII = Asc(sChar) 'Gets ASCII value of character
if bASCII(not in Range) Then ERROR
Next x
Here's a link for to the Ascii Values: http://www.asciitable.com/
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