Android Java - String .replaceAll 替换特定字符（正则表达式）
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Android Java - String .replaceAll to replace specific characters (regex)
提问by JozeRi
I need to remove some specific "special" characters and replace them with empty string if they show up. I am currently having a problem with the regex, probably with the Java escaping. I can't put them all together, it just doesn't work, I tried a lot! T_T
我需要删除一些特定的“特殊”字符，并在它们出现时用空字符串替换它们。我目前在使用正则表达式时遇到问题，可能与 Java 转义有关。我不能把它们放在一起，它就是行不通，我试了很多次！T_T
Currently I am doing it one by one which is kinda silly, but for now at least it works, like that :
目前我正在一个一个地做这有点傻，但至少现在它可以工作，就像这样：
public static String filterSpecialCharacters(String string) {
string = string.replaceAll("-", "");
string = string.replaceAll("\[", "");
string = string.replaceAll("\]", "");
string = string.replaceAll("\^", "");
string = string.replaceAll("/", "");
string = string.replaceAll(",", "");
string = string.replaceAll("'", "");
string = string.replaceAll("\*", "");
string = string.replaceAll(":", "");
string = string.replaceAll("\.", "");
string = string.replaceAll("!", "");
string = string.replaceAll(">", "");
string = string.replaceAll("<", "");
string = string.replaceAll("~", "");
string = string.replaceAll("@", "");
string = string.replaceAll("#", "");
string = string.replaceAll("$", "");
string = string.replaceAll("%", "");
string = string.replaceAll("\+", "");
string = string.replaceAll("=", "");
string = string.replaceAll("\?", "");
string = string.replaceAll("|", "");
string = string.replaceAll("\"", "");
string = string.replaceAll("\\", "");
string = string.replaceAll("\)", "");
string = string.replaceAll("\(", "");
return string;
}
Those are all the character I need to remove:
这些是我需要删除的所有字符：
- [ ] ^ / , ' * : . ! > < ~ @ # $ % + = ? | " \ ) (
I am clearly missing something, I can't figure out how to put it all in one line. Help?
我显然遗漏了一些东西，我不知道如何将它们全部放在一行中。帮助？
采纳答案by Wiktor Stribi?ew
Your code does not work in fact because .replaceAll("$", "")replaces an end of string with empty string. To replace a literal $, you need to escape it. Same issue is with the pipe symbol removal.
您的代码实际上不起作用，因为.replaceAll("$", "")用空字符串替换了字符串的结尾。要替换文字$，您需要对其进行转义。同样的问题是删除管道符号。
All you need to do is to put the characters you need to replace into a character class and apply the +quantifier for better performance, like this:
您需要做的就是将需要替换的字符放入字符类中并应用+量词以获得更好的性能，如下所示：
string = string.replaceAll("[-\[\]^/,'*:.!><~@#$%+=?|\"\\()]+", "");
Note that inside a character class, most "special regex metacharacters" lose their special status, you only have to escape [, ], \, a hyphen (if it is not at the start/end of the character class), and a ^(if it is the first symbol in the "positive" character class).
请注意，在字符类中，大多数“特殊正则表达式元字符”失去了它们的特殊状态，您只需转义[, ], \, 连字符（如果它不在字符类的开头/结尾）和 a ^（如果它是“正”字符类中的第一个符号）。
DEMO:
演示：
String s = "-[]^/,'*:.!><~@#$%+=?|\"\()TEXT";
s = s.replaceAll("[-\[\]^/,'*:.!><~@#$%+=?|\"\\()]+", "");
System.out.println(s); // => TEXT
回答by Shree Krishna
Use these codes
使用这些代码
String REGEX = "YOUR_REGEX";
Pattern p = Pattern.compile(REGEX);
Matcher m = p.matcher(yourString);
yourString = m.replaceAll("");
UPDATE :
更新 ：
Your REGEX looks something like
你的正则表达式看起来像
String REGEX = "-|\[|\]|\^|\/|,|'|\*|\:|\.|!|>|<|\~|@|#|\$|%|\+|=\?|\||\\|\\\\|\)|\(";
SAPMLE :
SAPMLE :
String yourString = "#My (name) -is @someth\ing"";
//Use Above codes
Log.d("yourString",yourString);
OUTPUT
输出
