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VB.Net check string for special characters

  
Code snippet below will check for letters and numbers on the string.

 Sub check_for_special_char()

        Dim regexItem As Regex = New Regex("^[a-zA-Z0-9 ]*$")
        Dim xval_regex As Boolean

        xval_regex = regexItem.IsMatch(TextBox1.Text)
        '        MsgBox(xval_regex)

        If xval_regex = "False" Then

            MsgBox("No special characters/symbols allowed.") 

              else
            MsgBox("No special characters found on the string") 

        End If

  End Sub

To bypass or include some other characters such as "-" dash sign or the ampersand "&" use the code below.

 Sub check_for_special_char()

        Dim regexItem As Regex = New Regex("^[a-zA-Z0-9\-& ]*$")
        Dim xval_regex As Boolean

        xval_regex = regexItem.IsMatch(TextBox1.Text)
        '        MsgBox(xval_regex)

        If xval_regex = "False" Then

            MsgBox("No special characters/symbols allowed.") 

              else

            MsgBox("No special characters found on the string") 

        End If

 End Sub


[a-zA-Z0-9\-& ] --- Regex to check for small and capital letters, numbers, dash sign and ampersand.

The dash sign is preceded with the back slash that tells regex to interpret the character literally and search for the character.

To use regex in VB.Net you need to declare this import, Imports System.Text.RegularExpressions




Cheers.. Have fun...

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Comments

  1. AnonymousJuly 12, 2023 at 7:34 AM

    thanks bro, saved me a lot of time

    ReplyDelete
    Replies
    1. Sirch_wiredJuly 15, 2023 at 11:24 PM

      Thanks for dropping by, and letting us know you find it helpful

      Delete

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