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    <p> I have a idea about custom string replacement in Java. Not as easy as replacement function in JavaScript but it just works fine. Here is the code: </p> <pre><code> package org.eve.util; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.regex.Matcher; import java.util.regex.Pattern; public class StringUtils{ public static String replaceWithFn(CharSequence input,String regexp,Method fn,int group){ Matcher m=Pattern.compile(regexp).matcher(input); StringBuffer sb=new StringBuffer(); try { Object obj=Modifier.toString(fn.getModifiers()).indexOf("static")&gt;-1? fn.getClass():fn.getDeclaringClass().newInstance(); if(fn.getReturnType()!=String.class){ System.out.println("replacement function must return type \"String\"."); } while(m.find()){ m.appendReplacement(sb, (String)fn.invoke(obj, m.group(group))); } m.appendTail(sb); } catch (Exception e) { e.printStackTrace(); } return sb.toString(); } } </code></pre> <p>&nbsp;</p> <p><code><pre> package org.eve.test;</p> <pre><code>import org.eve.util.StringUtils; public class ReplaceTest { public static void main(String[] args) { try { StringBuffer input=new StringBuffer("\\u039D\\u03B9\\u03BA\\u03CC\\u03BB\\u03B1\\u03BF\\u03C2 Nicholas \\u5C3C\\u53E4\\u62C9\\u65AF"); System.out.println("input="+input); String result=StringUtils.replaceWithFn( input, "\\\\u([0-9a-zA-Z]{4})", ReplaceTest.class.getMethod("hex2char",String.class), 1 ); System.out.println("output="+result); } catch (SecurityException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } } public String hex2char(String s){ //TODO replaceholder return String.valueOf((char)Integer.parseInt(s,16)); } } </code></pre> <p></code></pre></p> <p> Just for fun. </p>
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    1. POUsing functions or methods in Java's String.replaceAll() regex
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