你在表达式后面有 $ ，在开头有 ^ ，这意味着你正在接受正好一个字符.

You have the $ after your expression and the ^ in the beginning, which means you are accepting exactly one character.

编辑(基于评论):

您可以尝试查看您的输入字段是否仅具有有效字符，通过将其与此匹配(如果匹配，则表示没有无效字符):

You can try to see if your input fields only have valid characters, by matching it against this (if it matches, it means there are no invalid characters):

$rex = '/^[^<,"@$?=>|;#]+$/i'

你也可以反过来，即测试你的输入字段是否有任何无效字符，使用chaos提供的正则表达式:

You can also do the reverse, that is, test if your input fields have any invalid characters, using the regex provided by chaos:

$rex = '/[<,"@$?=>|;#]/';

这样，如果正则表达式匹配，则意味着您有无效字符.

This way, if the regex matches, then it means you have invalid characters.