正则表达式-必须包含字母数字和斜杠 [英] REGEX - must contain alphanumeric and slash

问题描述

我正在尝试验证输入字段必须包含字母数字和斜杠作为其值.

I am trying to do a validation that an input field must contain alpha numeric and slash as its value.

例如:AA/AB/12314/2017/ASD

Eg: AA/AB/12314/2017/ASD

上面显示的是应作为输入字段的值的示例. 我对编写正则表达式一无所知.所以请帮助我.

The above shown is the example of the value that should be the input field. I don't have any knowledge in writing the regular expressions. So please do help me.

最后我想出了以下代码:

Finally I came up with the below code:

var message = $('#message').val();

if (/^[a-zA-Z0-9-/]*$/.test($.trim(message)) == false)
{
    $('#message').focus();
    alert('invalid message');
}

推荐答案

它必须同时包含字母数字和斜杠.

it must contain both alphanumeric and slash.

我了解您可能有1+个字母数字符号，后跟至少1个/，后跟更多字母数字符号.您需要将正则表达式更改为/^[a-z\d]+(?:\/[a-z\d]+)+$/i:

I understand that you may have 1+ alphanumeric symbols followed with at least 1 / followed with more alphanumeric symbols. You need to change the regex to /^[a-z\d]+(?:\/[a-z\d]+)+$/i:

var message = $('#message').val();
if (!/^[a-z\d]+(?:\/[a-z\d]+)+$/i.test($.trim(message)))
{
    $('#message').focus();
    alert('invalid message');
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="message" value="ASD/TD"/>

详细信息:

• ^-字符串开头
• [a-z\d]+-1个或多个字母或数字
• (?:\/[a-z\d]+)+-1个或多个序列
  • \/-斜杠
  • [a-z\d]+-1个或多个字母或数字
  • ^ - start of string
  • [a-z\d]+ - 1 or more letters or digits
  • (?:\/[a-z\d]+)+ - 1 or more sequences of
    • \/ - slash
    • [a-z\d]+ - 1 or more letters or digits

    如果您的意思是字符串中必须在任意位置包含/和字母数字 ，请使用前行:

    If you mean there must be a / and alphanumeric anywhere inside the string, use lookaheads:

    /^(?=[a-z\d]*\/)(?=\/*[a-z\d])[a-z\d\/]+$/i
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
    

    请参见 regex演示.此处，(?=[a-z\d]*\/)在0+字母数字后需要/，而(?=\/*[a-z\d])在0+斜杠后需要字母数字. [a-z\d\/]+将匹配1个或多个字母数字或斜杠.

    See the regex demo. Here, (?=[a-z\d]*\/) requires a / after 0+ alphanumerics, and (?=\/*[a-z\d]) requires an alphanumeric after 0+ slashes. [a-z\d\/]+ will match 1 or more alphanumeric or slashes.

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