Java：正则表达式替换字符串

Question

考虑以下字符串：

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

我有一个具有正确匹配项和句子编号的ArrayList<ArrayList<String>> anaphora ，以及具有s的句子的ArrayList<String> sentences 。 两者都看起来像这样：

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.

现在，在尝试替换子字符串时出现了问题。

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));
}

输出将是：

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.

预期的输出将以这样的方式将“他”替换为“拉尔夫”：

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

问题如何修复正则表达式替换，以便仅替换正确的“他”？

Answer 1

如上所述，您可以使用单词边界，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：

拉尔夫走在街上，拉尔夫看见玛丽，爱上了她。

Answer 2

您需要注意空白。 因此，如果被替换的字符串是一个单词，则您的正则表达式仅应进行替换。