Java查找和替换字符串的最佳方法？ [英] Java best way for string find and replace?

问题描述

我正在寻找用Java搜索和替换字符串的最佳方法。

I'm looking for the best approach for string find and replace in Java.

这是一句话：我的名字是米兰，人们都认识米兰瓦西奇。

This is a sentence: "My name is Milan, people know me as Milan Vasic".

我想用Milan Vasic替换米兰的字符串，但在我已经使用Milan Vasic的地方，这不应该是一个案例。

I want to replace the string Milan with Milan Vasic, but on place where I have already Milan Vasic, that shouldn't be a case.

搜索/替换后的结果应该是：我的名字是Milan Vasic，人们都认为我是Milan Vasic。

after search/replace result should be: "My name is Milan Vasic, people know me as Milan Vasic".

我尝试使用indexOf（）以及Pattern / Matcher组合，但我的结果都不优雅，有人有优雅的解决方案吗？

I was try to use indexOf() and also Pattern/Matcher combination, but neither of my results not looks elegant, does someone have elegant solution?

欢呼！

推荐答案

好吧，你可以使用正则表达式查找米兰未跟随Vasic的情况：

Well, you can use a regular expression to find the cases where "Milan" isn't followed by "Vasic":

Milan(?! Vasic)

并用全名替换：

String.replaceAll("Milan(?! Vasic)", "Milan Vasic")

（？！...） part是否定前瞻，确保零件不遵循任何匹配在括号内。它不会消耗匹配中的任何字符。

The (?!...) part is a negative lookahead which ensures that whatever matches isn't followed by the part in parentheses. It doesn't consume any characters in the match itself.

或者，你可以简单地插入（好的，技术上替换零宽度匹配）后面的第一个名字名称，除非它后面跟着姓氏。这看起来很相似，但也使用了正面观察：

Alternatively, you can simply insert (well, technically replacing a zero-width match) the last name after the first name, unless it's followed by the last name already. This looks similar, but uses a positive lookbehind as well:

(?<=Milan)(?! Vasic)

你可以用Vasic替换它（注意字符串开头的空格）：

You can replace this by just " Vasic" (note the space at the start of the string):

String.replaceAll("(?<=Milan)(?! Vasic)", " Vasic")

您可以尝试此处了解这些内容。例如。

You can try those things out here for example.

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