Java：正則表達式替換字符串

Question

考慮以下字符串：

s = "Ralph was walking down the street, he saw Mary and fell in love with her. Judy loves her hair."

我有一個具有正確匹配項和句子編號的ArrayList<ArrayList<String>> anaphora ，以及具有s的句子的ArrayList<String> sentences 。 兩者都看起來像這樣：

anaphora.get(0) = [0, Ralph, he]
anaphora.get(1) = [0, Mary, her]
anaphora.get(2) = [0, the street]
anaphora.get(3) = [1, Judy, her]
anaphora.get(4) = [1, her hair]

sentences.get(0) = Ralph was walking down the street, he saw Mary and fell in love with her.
sentences.get(1) = Judy loves her hair.

現在，在嘗試替換子字符串時出現了問題。

sentence = sentences.get(0);
if (anaphora.get(0).size()>2){
    example1 = sentence.replaceAll("[^a-zA-Z]"+anaphora.get(0).get(i)+"[^a-zA-Z]", anaphora.get(0).get(1));
    example2 = sentence.replaceAll(anaphora.get(0).get(i), anaphora.get(0).get(1));
}

輸出將是：

example1 = Ralph was walking down the street,Ralphsaw Mary and fell in love with her.
example2 = Ralph was walking down tRalph street, Ralph saw Mary and fell in love with Ralphr.

預期的輸出將以這樣的方式將“他”替換為“拉爾夫”：

Ralph was walking down the street, Ralph saw Mary and fell in love with her.

問題如何修復正則表達式替換，以便僅替換正確的“他”？

Answer 1

如上所述，您可以使用單詞邊界，例如：

String s = "Ralph was walking down the street, he saw Mary and fell in love with her.";
System.out.println(s.replaceAll("\\bhe\\b", "Ralph"));

印刷品：

拉爾夫走在街上，拉爾夫看見瑪麗，愛上了她。

Answer 2

您需要注意空白。 因此，如果被替換的字符串是一個單詞，則您的正則表達式僅應進行替換。