jQuery：检查字符串中是否存在特殊字符 [英] jQuery: Check if special characters exists in string

问题描述

我知道这个问题在Stack上经常被问到，但我似乎无法从已发布的问题中得到直接的答案。

I know this question is asked more often here on Stack, but I can't seem to get a straight answer out of the questions already posted.

我需要检查是否所有特殊字符（除了 - ）都在一个字符串中，如果是，则给用户一个警告。

I need to check if all special characters (except -) are in a string, if so, then give the user an alert.

到目前为止我所拥有的是：

What I have so far is this:

if($('#Search').val().indexOf('@') == -1 || $('#Search').val().indexOf('#') == -1 || $('#Search').val().indexOf('$') == -1 || $('#Search').val().indexOf('%') == -1 || $('#Search').val().indexOf('^') == -1 || $('#Search').val().indexOf('&') == -1 || $('#Search').val().indexOf('*') == -1 || $('#Search').val().indexOf('(') == -1 || $('#Search').val().indexOf(')') == -1 || $('#Search').val().indexOf('_') == -1 || $('#Search').val().indexOf('\'') == -1 || $('#Search').val().indexOf('\"') == -1 || $('#Search').val().indexOf('\\') == -1 || $('#Search').val().indexOf('|') == -1 || $('#Search').val().indexOf('?') == -1 || $('#Search').val().indexOf('/') == -1 || $('#Search').val().indexOf(':') == -1 || $('#Search').val().indexOf(';') == -1 || $('#Search').val().indexOf('!') == -1 || $('#Search').val().indexOf('~') == -1 || $('#Search').val().indexOf('`') == -1 || $('#Search').val().indexOf(',') == -1 || $('#Search').val().indexOf('.') == -1 || $('#Search').val().indexOf('<') == -1 || $('#Search').val().indexOf('>') == -1 || $('#Search').val().indexOf('{') == -1 || $('#Search').val().indexOf('}') == -1 || $('#Search').val().indexOf('[') == -1 || $('#Search').val().indexOf(']') == -1 || $('#Search').val().indexOf('+') == -1 || $('#Search').val().indexOf('=') == -1)
{
   // Code that needs to execute when none of the above is in the string
}
else
{
  alert('Your search string contains illegal characters.');
}

但这似乎不起作用...任何人都可以帮助我这件事？

But this doesn't seem to work... Can anyone help me on this matter?

提前致谢！

Guido

推荐答案

如果你真的想检查所有这些特殊字符，那么使用正则表达式会更容易：

If you really want to check for all those special characters, it's easier to use a regular expression:

var str = $('#Search').val();
if(/^[a-zA-Z0-9- ]*$/.test(str) == false) {
    alert('Your search string contains illegal characters.');
}

上述内容仅允许字符串完全由字符组成 az ， AZ ， 0-9 ，加上连字符空格字符。包含任何其他字符的字符串将导致警报。

The above will only allow strings consisting entirely of characters on the ranges a-z, A-Z, 0-9, plus the hyphen an space characters. A string containing any other character will cause the alert.

这篇关于jQuery：检查字符串中是否存在特殊字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！