RegEx将拒绝未转义的HTML字符-RegExtoRejectUnescapedHTMLCharacter

8  

This regular expression matches any occurrence of & which is not followed by amp;:

这个正则表达式匹配任何不跟在amp后面的&的出现:

/&(?!amp;)/

Rubular

Rubular

This regular expression accepts strings that contain characters except &, or the string &:

这个正则表达式接受包含除&或字符串&之外的字符的字符串:

/^([^&]|&)*$/

Rubular

Rubular

You can use either one or the other, depending on which is most convenient. The difference is that the string should be rejected if the first regular expression matches, whereas the string should be accepted if the second regular expression matches.

您可以使用其中一种，也可以使用另一种，这取决于哪种方式最方便。不同的是，如果第一个正则表达式匹配，就应该拒绝字符串，而如果第二个正则表达式匹配，则应该接受字符串。

0  

You can match on /&(?!amp;)/ to locate any &'s not followed by &. The (?!) construction is called a negative lookahead.

你可以在/&(?!安培)/上找到任何没有紧跟着的安培。这种(?!)结构被称为“负面展望”。

Assuming you're using a regexp engine that supports them, at any rate. I know Perl/PCRE regexps do.

假设您正在使用支持它们的regexp引擎，无论如何。我知道Perl/PCRE regexp是这样的。