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Thread: How to check for character?

  1. Oct 15th, 2003, 10:32 PM #1
    berrie_luv
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    How to check for character?

    Hello, i need to check the character whcich the user input. For eg: I got email add, then need them to enter the full address of the email, then i need to check where the @ sign exists.
    So how do i check? Can pls give mi some codes, i need this urgently. Thanks all the kind souls out there, hav a nice day...
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  2. Oct 16th, 2003, 02:27 AM #2
    dynamic_sysop
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    you mean this? ...
    VB Code:
    1. [COLOR=blue]If Not[/COLOR] TextBox1.Text.IndexOf("@") = -1 [COLOR=blue]Then[/color]

    2.             [COLOR=blue]Dim[/color] x [COLOR=blue]As Integer[/color] = TextBox1.Text.IndexOf("@")

    3.             MessageBox.Show("the textbox contains the @ sign at char posistion : " & x)

    4.         [COLOR=blue]End If[/color]
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  3. Oct 16th, 2003, 03:13 AM #3
    berrie_luv
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    Sorrie, no, i mean is i need to check whether the user enter email add in the text box got the @ sign anot. If not, then need to prompt them error, if got, then save into the database.
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  4. Oct 16th, 2003, 04:38 AM #4
    dynamic_sysop
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    the above code does check to see if there's an @ symbol , all you need is to make it suit your needs , eg:
    VB Code:
    1. [color=blue]If Not[/color] TextBox1.Text.IndexOf("@") = -1 [color=blue]Then[/color] [color=green]'/// if the string contains the @ symbol[/color]

    2.             [color=green]'/// carry out your code for the string because it contains an email address.[/color]

    3.         [color=blue]Else[/color] [color=green]'/// if it doesn't contain the @ symbol...[/color]

    4.             MessageBox.Show("you did not type a valid email address, please try again!")

    5.         [color=blue]End If[/color]
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  6. Oct 16th, 2003, 04:44 AM #5
    berrie_luv
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    Oh, it works. Thanks a lot.
    So how about checking for like not more than 1 @ sign?
    Then how to check e email should be .com/.gov/.edu... etc behind?
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  7. Oct 16th, 2003, 06:23 AM #6
    dynamic_sysop
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    like this then ...
    VB Code:
    1. [COLOR=BLUE]If[/COLOR] [COLOR=BLUE]Not[/COLOR] TextBox1.Text.IndexOf("@") = -1 [COLOR=BLUE]Then

    2. [/COLOR]            [COLOR=BLUE]Dim[/COLOR] x [COLOR=BLUE]As[/COLOR] [COLOR=BLUE]Integer[/COLOR] = [color=black]UBound[/color](TextBox1.Text.[color=black]Split[/color]("@"c))

    3.             [COLOR=BLUE]If[/COLOR] x = 1 [COLOR=BLUE]Then

    4. [/COLOR]                [COLOR=BLUE]If[/COLOR] TextBox1.Text.EndsWith(".com".ToLower) [COLOR=BLUE]Or[/COLOR] TextBox1.Text.EndsWith(".net".ToLower) [COLOR=BLUE]Or[/COLOR] TextBox1.Text.EndsWith(".gov".ToLower) [COLOR=BLUE]Then

    5. [/COLOR]                    [COLOR=GREEN]'/// it ends with .com or .net or .gov ( etc... depending what you want to look for at the end of the address )

    6. [/COLOR]                    [COLOR=GREEN]'/// do your stuff here because it's a valid address...

    7. [/COLOR]                [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]If

    8. [/COLOR]            [COLOR=BLUE]Else

    9. [/COLOR]                [COLOR=GREEN]'/// it's got more than 1 @ symbol.

    10. [/COLOR]                MessageBox.Show("to many @ symbols in the address!")

    11.             [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]If

    12. [/COLOR]        [COLOR=BLUE]Else

    13. [/COLOR]            MessageBox.Show("Oops that's not a valid email address!")

    14.         [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]If[/COLOR]
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