java - 替换java中的所有单词

Question

我正在使用 java replaceAll() 方法来替换字符串中的匹配单词。在我的情况下，如果这个词在逗号 (,) 句号 (.) 或其他类似的东西旁边，这个词不会被替换。

例子：和。和，和；和（

这是代码：

body = body.replaceAll("(?i) "+knownWord + " ", replaceWord);

谁能建议我一个能够识别该字符串中所有单词的正则表达式？

Answer 1

这正如您指定的那样：

(?<![.,])\b(\w+)\b(?![.,])

调试演示

只要它们不在逗号或句点旁边，它就会找到（并捕获）单词。只需将您喜欢的任何标点符号添加到字符类中，例如[.,?(].

这是为 Java 字符串转义的正则表达式："(?<![.,])\\b(\\w+)\\b(?![.,])"

至于忽略大小写，只需将CASE_INSENSITIVE标志传递给您的 Pattern 对象，例如

Pattern p = Pattern.compile(theAbovePattern, Pattern.CASE_INSENSITIVE);

Answer 2

If you want to match specific knownWord do:

  body = body.replaceAll("(?i)\\b"+knownWord + "\\b", replaceWord);

I think what you were looking for is the \\b (word boundary) it is used to detect where words start/end, so commas or dots should no longer be a problem then.

More detailed example in response to your comment:

 String body = "I'm going to school. ";
 String knownWord = "school";
 String replaceWord = "shop";
 System.out.println(body.replaceAll("(?i)\\b"+knownWord + "\\b", replaceWord));

The above will print out the following:

I'm going to shop.