CODEWITHSUNDEEP
javascriptregex
kalls
kalls

Reputation: 2855

Regular Expression Validator - How to include certain special characters

I am using the following regular expression on my regular expression validator

<asp:RegularExpressionValidator ID="revAddress" runat="server" ControlToValidate="txtAddress" ValidationExpression="^[a-zA-Z0-9 ]+$" ErrorMessage="Alphabets and Numbers only" ForeColor="Red"> </asp:RegularExpressionValidator>

The expression being - ^[a-zA-Z0-9 ]+$

This allows letters, numbers and spaces and I tried . \, and it wasn't working Now, wondering how to include these special characters.

dot (.) Comma(,) hypen (-) and slash (/)

I appreciate your help.

Upvotes: 0

Views: 4923

Answers (3)

Ωmega
Ωmega

Reputation: 43663

You need to list - as the first or the last character within [...]

^[a-zA-Z0-9 .,/-]+$

or

[-a-zA-Z0-9 .,/]+$

as in between it has range meaning, as you used it for a-z, A-Z and 0-9.

Other option is to escape - by \

^[a-zA-Z0-9 .,\-/]+$

Some environments require also / character to be escaped. As escaping does not hurt, you should go with

^[a-zA-Z0-9 .,\-\/]+$

Upvotes: 1

raina77ow
raina77ow

Reputation: 106375

This should do the trick, I suppose: 

ValidationExpression="^[a-zA-Z0-9 ./,-]+$"

Of the symbols mentioned, only '-' (hyphen) can have the special meaning inside the regex character class - but only if it's not the first or the last one there (it's used to specify a range of characters).

In other words, it shouldn't be written like this:

ValidationExpression="^[a-zA-Z0-9 .-/,]+$"
                                  ^^^ <- parsed as 'characters between . and /'

Upvotes: 1

Fabrizio Calderan
Fabrizio Calderan

Reputation: 123377

just add those characters in your class (escaping the hyphen and /)

 ^[a-zA-Z0-9,.\/\-]+$

example jsbin : http://jsbin.com/eweren/2/edit

Upvotes: 2

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