如果&符号尚未编码，该如何编码？

问题描述

如果&号尚未被编码或不是另一个编码的epxression的一部分，我需要使用ac＃方法对其进行编码

I need a c# method to encode ampersands if they are not already encoded or part of another encoded epxression

例如

"tom & jill" should become "tom & jill"


"tom & jill" should remain "tom & jill"


"tom € jill" should remain "tom € jill"


"tom <&> jill" should become "tom <&amp;> jill"


"tom &quot;&&quot; jill" should become "tom &quot;&amp;&quot; jill"

推荐答案

这应该做得很好：

text = Regex.Replace(text, @"
    # Match & that is not part of an HTML entity.
    &                  # Match literal &.
    (?!                # But only if it is NOT...
      \w+;             # an alphanumeric entity,
    | \#[0-9]+;        # or a decimal entity,
    | \#x[0-9A-F]+;    # or a hexadecimal entity.
    )                  # End negative lookahead.", 
    "&",
    RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

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