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Regular expression to allow alpha numeric plus some other characters.

Posted on 2016-09-19
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Last Modified: 2016-09-19
Please can I have a regular expression for C# to allow alpha numeric characters plus the following:
( ) & = . / , : ' + -

I tried this which seems to work unless the forbidden character is last.  I based myself on this site.
https://www.owasp.org/index.php/OWASP_Validation_Regex_Repository

Function ValidateRtrDescription(ByVal Description As String) As Boolean

        Dim emailRegex As New System.Text.RegularExpressions.Regex("[^[a-zA-Z0-9 ()&=./,:'+-]$")  '%[A-Za-z,~:/;#-.]%'
        Dim emailMatch As System.Text.RegularExpressions.Match = emailRegex.Match(Description)
        Return emailMatch.Success
    End Function
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Question by:AlHal2
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12 Comments
 
LVL 49

Expert Comment

by:Rgonzo1971
ID: 41804546
HI,

pls try
       Dim emailRegex As New System.Text.RegularExpressions.Regex("[^[a-zA-Z0-9\(\)&=\./,:'\+-]$")  '%[A-Za-z,~:/;#-.]%'

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REgards
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Author Comment

by:AlHal2
ID: 41804563
It let this through.  ~ is not valid.

Hong Kong Stock Exchange Equities+~
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LVL 49

Expert Comment

by:Rgonzo1971
ID: 41804600
I've based my answer with line 2

then try

       Dim emailRegex As New System.Text.RegularExpressions.Regex("[^[a-zA-Z0-9\(\)&=\./,;:'\~#-]$")  '%[A-Za-z,~:/;#-.]%'

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Author Comment

by:AlHal2
ID: 41804626
I'm using this expression which you gave me.  It's rejecting these which should be accepted.

Hong Kong Stock Exchange Equities+:
Hong Kong Stock Exchange Equities
HongKongStockExchangeEquities+;

Dim emailRegex As New System.Text.RegularExpressions.Regex("[^[a-zA-Z0-9\(\)&=\./,;:'\~#-]$")  '%[A-Za-z,~:/;#-.]%'

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Expert Comment

by:Rgonzo1971
ID: 41804636
Sorry I've deleted the space and the plus
       Dim emailRegex As New System.Text.RegularExpressions.Regex("[^[a-zA-Z0-9\(\)&=\s\./,;:'#~\+-]$")  '%[A-Za-z,~:/;#-.]%'

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Author Comment

by:AlHal2
ID: 41804786
It's rejecting this.

Hong Kong Stock Exchange Equities
0
 
LVL 49

Expert Comment

by:Rgonzo1971
ID: 41804801
let's try
       Dim emailRegex As New System.Text.RegularExpressions.Regex("^[a-zA-Z0-9\(\)&=\s\./,;:'#~\+-]+$")  '%[A-Za-z,~:/;#-.]%'

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Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 41804838
Hi AlHal2;

Try this pattern to see if it helps.
Dim emailRegex As New System.Text.RegularExpressions.Regex("^[a-zA-Z0-9 \(\)&=\./,:;'\+-]+$")

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Author Comment

by:AlHal2
ID: 41804854
It accepted
Hong Kong Stock Exchange Equities+~
even though ~ is forbidden.
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LVL 49

Expert Comment

by:Rgonzo1971
ID: 41804859
then try
       Dim emailRegex As New System.Text.RegularExpressions.Regex("^[a-zA-Z0-9\(\)&=\s\./,;:'#\+-]+$")

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Author Closing Comment

by:AlHal2
ID: 41804861
Please ignore what I said before.  This works so far.

Thanks,
Alistair
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LVL 63

Expert Comment

by:Fernando Soto
ID: 41805298
Not a problem Alistair, glad to help.
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