Java 如何替换字符串中的所有特殊字符？
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How to replaceAll special characters in a string?
提问by user2743857
So to remove all the spaces in my string. I did a method that is consists of
所以删除我的字符串中的所有空格。我做了一个方法，包括
message = message.replaceAll("\s", "");
I was wondering if there was a command to remove and special character, like a comma, or period and just have it be a string. Do i have to remove them one by one or is there a piece of code that I am missing?
我想知道是否有删除特殊字符的命令，例如逗号或句点，并将其设为字符串。我必须一个一个地删除它们还是有一段代码我遗漏了？
回答by Rohit Jain
You can go the other way round. Replace everything that is not word characters, using negated character class:
你可以反过来。使用否定字符类替换所有不是单词字符的内容：
message = message.replaceAll("[^\w]", "");
or
或者
message = message.replaceAll("\W", "");
Both of them will replace the characters apart from [a-zA-Z0-9_]. If you want to replace the underscore too, then use:
它们都将替换除[a-zA-Z0-9_]. 如果您也想替换下划线，请使用：
[\W_]
回答by Chris Lohfink
\w is the same [A-Za-z0-9_] which will strip all spaces and such (but not _). Much safer to whitelist whats allowed instead of removing individual charecters.
\w 是相同的 [A-Za-z0-9_]，它将去除所有空格等（但不是 _）。将允许的内容列入白名单而不是删除单个字符要安全得多。
回答by Bohemian
Contrary to what some may claim, \wis notthe same as [a-zA-Z0-9_]. \walso includes all characters from all languages (Chinese, Arabic, etc) that are letters or numbers (and the underscore).
相反，有些可能声称，\w是不一样的[a-zA-Z0-9_]。\w还包括来自所有语言（中文、阿拉伯语等）的所有字母或数字（以及下划线）字符。
Considering that you probably consider non-Latin letters/numbers to be "special", this will remove all "non-normal" characters:
考虑到您可能认为非拉丁字母/数字是“特殊的”，这将删除所有“非正常”字符：
message = message.replaceAll("[^a-zA-Z0-9]", "");
