如何用Java中的相应字符替换特定字符? [英] How to replace specific characters with corresponding characters in java?
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问题描述
我想做这样的事情:将所有 ck
替换为 k
,将所有 dd
替换为 wr
,然后所有 f
和 m
,还有10个这样的替代品.我可以用 replace("ck","k").replace("dd","wr")
等来完成,但是它接缝很傻并且很慢.java中有没有做类似这样的功能的函数?例如 replace(string,stringArray1,stringArray2);
I want to do something like this: Replace all ck
with k
and all dd
with wr
and all f
with m
and 10 more replacements like this.
I can do it with replace("ck","k").replace("dd","wr")
and so on, but it seams silly and it is slow. Is there any function in java that does something like this?
for example replace(string,stringArray1, stringArray2);
推荐答案
private static String replace(String input, Map<String, String> mappings) {
StringBuffer buf = new StringBuffer();
Matcher m = Pattern.compile(toRegex(mappings.keySet())).matcher(input);
while (m.find())
m.appendReplacement(buf, Matcher.quoteReplacement(mappings.get(m.group())));
return m.appendTail(buf).toString();
}
private static String toRegex(Collection<String> keys) {
return keys.stream().map(Pattern::quote).collect(Collectors.joining("|"));
}
如果您不使用Java 8+,则第二种方法是:
If you're not using Java 8+, the second method would be:
private static String toRegex(Collection<String> keys) {
StringBuilder regex = new StringBuilder();
for (String key : keys) {
if (regex.length() != 0)
regex.append("|");
regex.append(Pattern.quote(key));
}
return regex.toString();
}
测试代码
Map<String, String> mappings = new HashMap<>();
mappings.put("ck","k");
mappings.put("dd","wr");
mappings.put("f", "m");
System.out.println(replace("odd flock", mappings)); // prints: owr mlok
有关运行版本,请参见 IDEONE .
See IDEONE for running version.
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