正则表达式（第一个字符必须是a-z）？ [英] Regular Expression (first character must be a-z)?

问题描述

你好，



我们想要正则表达式如下：



第一个字符只能是一个-zA-Z

不允许空格和连字符（ - ）以外的特殊字符



我们写了正则表达式^ [a-zA-Z] [\\\\ - - + +]

< asp：RegularExpressionValidator ID =   rev runat =   server 
 ControlToValidate =   txtDesignation显示=  动态 Text =  ！ ForeColor =  红色 
 ErrorMessage =  可能是字母数字&第一个字符必须是字母！ BackColor =  黄色 
 ValidationExpression =   ^ [a-zA-Z] \S  -  $ ValidationGroup =   insert /> 

它根据我的要求正常工作，但是，当我们只输入单个字符时，它不接受输入。



你能提出建议吗？

解决方案

ValidationGroup = insert />

它根据我的要求正常工作，但是，当我们只输入单个字符时，它不接受输入。


$ b $你能否提出建议？

 ^ [A-ZA-Z] [A-ZA-Z\s\  - ] * 

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-]+"

<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?

解决方案

" 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?

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

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