Regular Expression (first character must be a-z)?

Question

2.00/5 (1 vote)

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Hello,

We want the regular expression like:

First character can be only a-zA-Z
Not to allow special characters other than "space" and "hyphen(-)"

We wrote the regexp like "^[a-zA-Z][\w\s-]+"

VB

<asp:RegularExpressionValidator ID="rev" runat="server"
                                            ControlToValidate="txtDesignation" Display="Dynamic" Text="!" ForeColor="Red"
                                            ErrorMessage="Might be Alphanumeric & First character must be a letter!" BackColor="Yellow"
                                            ValidationExpression="^[a-zA-Z]\S-$" ValidationGroup="insert"/>

It was working properly according to my requirement, but, when we enter only single character it is not accepting to enter.

Can you please give the suggestions?

Posted 16-Jun-14 5:28am

Venkata Ghanitala

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2 solutions

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Peter Leow · Accepted Answer · 2014-06-16T05:37:00

Solution 2

^[a-zA-Z][a-zA-Z\s\-]*$

Posted 16-Jun-14 5:37am

Peter Leow

Updated 16-Jun-14 5:45am

v2

Comments

Brian A Stephens 16-Jun-14 15:28pm

This also corrects the issue of allowing underscores, which presumably he did not want. Now, if he truly wants to allow "spaces" rather than any whitespace, that's another change.

phil.o · Accepted Answer · 2014-06-16T05:33:00

Solution 1

Just change the '+' by a '*':

C#

string regexp = @"^[a-zA-Z][\w\s-]*";

Posted 16-Jun-14 5:33am

phil.o