• 替換字元

 Pattern p = Pattern.compile("cat");
 Matcher m = p.matcher("one cat two cats in the yard");
 StringBuffer sb = new StringBuffer();
 while (m.find()) {
     m.appendReplacement(sb, "dog");
 }
 m.appendTail(sb);
 System.out.println(sb.toString());

-將帶下滑線的英文欄位轉換為駝峰式命名

1." _(\\w)"代表匹配"name_value_age_birthday"
 
 _v,_a,_b
2." _(\\w\\w)"代表匹配"name_value_age_birthday" _va,_ag,_bi
3.matcher.group(1).toUpperCase()代表從匹配到字元的第一位開始擷取va，ag，bi

private static Pattern underLinePattern = Pattern.compile("_(\\w)");
/**
 * 將帶下滑線的英文欄位轉換為駝峰式命名
 * 編輯人:yjj
 * @return
 * 返回值型別: String
 */
public static String convertToCamelCase
 
(String str) {
     str = str.toLowerCase();  
      Matcher matcher = underLinePattern.matcher(str);  
      StringBuffer sb = new StringBuffer();  
      while(matcher.find()){  
          matcher.appendReplacement(sb, matcher.group(1).toUpperCase());  
      }  
      matcher.appendTail(sb);  
      return
 
 sb.toString();  
}