如何在java中避免某些字符 [英] How to escape certain characters in java

问题描述

我需要转义像 ^ ，。， [，] ， + 和 \ 标签和换行符不会是一个问题），而留下其他人如 * 和？。

I need to escape characters like ^, ., [, ], + and \ (tabs and newlines won't be an issue), while leaving others like * and ?.

EDIT =更具体来说，我有一个包含这些字符的字符串，我需要转义它们，以便它们不与正则表达式匹配。我需要为每个这些字符添加 \ ，但是单独进行这样的操作将需要7或8次扫描，我想在一次通过之中（IE：匹配的任何内容都以 \ 之前添加）

EDIT = More specifically, I have a string with these characters, and I need to escape them so that they are not matched by regular expressions. I need to prepend \ to each of these characters, but doing so individually would take 7 or 8 scans and I'd like to do it within just one pass (IE: anything that matches is prepended with \)

我该怎么做？

谢谢。

推荐答案

这个工作吗？

StringBuilder sb = new StringBuilder();
for (char c : myString.toCharArray())
{
    switch(c)
    {
        case '[':
        case ']':
        case '.':
        case '^':
        case '+':
        case '\\':
            sb.append('\\');
            // intended fall-through
        default:
            sb.append(c);
    }
}
String escaped = sb.toString();

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