I’m validating a textbox for valid email with this:
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
ControlToValidate="txtMailCustom"
Text="Invalid address"
ValidationExpression="^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]
{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$" runat="server" />
Now I want users to be able to put multiple email addresses , separated by a comma and space.
How can I integrate that behaviour ?
Answers:
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Method 1
Try the expression below, which works for me:
((w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*)*([,])*)*
The above code is for ,, separating e-mail addresses.
If you would like to use ; instead of ,, than replace , with ; at the end of the above expression.
Method 2
try this expression:
^(s*,?s*[0-9a-zA-Z]([-.w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-w]*[0-9a-zA-Z].)+[a-zA-Z]{2,9})+s*$
Method 3
I should do this: what it does is check for at least one mail, and for list of email before it with each a comma and possibly a space.
^(([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?), ?)*^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$
Use this if the space between each mail is required:
^(([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?), )*^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$
Note I just used your single mail checker as a base and didn’t really edit it.
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0