Write code to convert camel case to underscore
//package com.book2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String[] argv) { String source = "AcamDef book2s.com"; System.out.println(camel2Score(source)); }/*from w w w . j a va 2 s . c om*/ public static String camel2Score(String source) { return pascal2Score(source); } public static String pascal2Score(String source) { String regexStr = "[A-Z]"; Matcher matcher = Pattern.compile(regexStr).matcher(source); StringBuffer stringBuffer = new StringBuffer(); while (matcher.find()) { String g = matcher.group(); matcher.appendReplacement(stringBuffer, "_" + g.toLowerCase()); } matcher.appendTail(stringBuffer); if (stringBuffer.charAt(0) == '_') { stringBuffer.delete(0, 1); } return stringBuffer.toString(); } }