c# – 正则表达式改变文本案例

发布时间：2020-12-16 02:04:03 所属栏目：百科来源：网络整理

导读：我想将标签之间的文本替换为大写版本. 有没有办法只使用 Regex.Replace方法？ (不使用IndexOf) 以下是我尝试的代码： string texto = "We are living in a upcaseyellow submarine/upcase. We don't have upcaseanything/upcase else."; Console.WriteLine(R

我想将标签之间的文本替换为大写版本.
有没有办法只使用 Regex.Replace方法？ (不使用IndexOf)

以下是我尝试的代码：

string texto = "We are living in a <upcase>yellow submarine</upcase>. We don't have <upcase>anything</upcase> else.";                
Console.WriteLine(Regex.Replace(texto,"<upcase>(.*)</upcase>","$1".ToUpper()));

预期的结果是：

We are living in YELLOW SUBMARINE. We don't have ANYTHING else.

但我得到：

We are living in yellow submarine. We don't have anything else.

解决方法

我愿意,

string str = "We are living in a <upcase>yellow submarine</upcase>. We don't have <upcase>anything</upcase> else.";
string result = Regex.Replace(str,"(?<=<upcase>).*?(?=</upcase>)",m => m.ToString().ToUpper());
Console.WriteLine(Regex.Replace(result,"</?upcase>",""));

输出：

We are living in a YELLOW SUBMARINE. We don't have ANYTHING else.

IDEONE

说明：

>(？< =< upcase>).*？(？=< / upcase>) – 匹配介于< upcase>之间的文本,< / upcase>标签. (？< = ...)调用positive lookbehind assertion,这里断言匹配必须以< upcase>开头.串. (？=< / upcase>)称为正向前瞻,断言匹配必须后跟< / upcase>串.因此,第二行代码将所有匹配的字符更改为大写,并将结果存储到结果变量中.> /？可选/(正斜杠).所以第三行代码替换了所有< upcase>或< / upcase>标签以空字符串形式存在于结果变量中并打印最终输出.

（编辑：李大同）

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