java中替换正则表达式中的组数据_java 正则替换某个group的数字-优快云博客

本文介绍如何使用正则表达式与StringBuilder进行字符串中特定模式的查找与替换，通过两个示例展示了如何在Java中实现这一过程，适用于需要动态替换配置或属性的场景。

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步骤一，先用正则表达式找出要替换的组数据，可以得到分组数据的start,end索引
步骤二，用stringbuilder的有索引参数的replace方法替换
public String replaceProperty(String plan,String subject,String condition) throws Exception {
    String regex = "\\{(\\D+?)}";
    Pattern pattern = Pattern.compile(regex);
    StringBuilder sbc = new StringBuilder();
    Matcher match;
    for (match = pattern.matcher(condition); match.find(); match = pattern.matcher(condition)){
        String id = LoyaltyConfig.findIdByProperty(plan,subject,match.group(1));
        sbc = new StringBuilder(condition).replace(match.start(1),match.end(1),id);
        condition = sbc.toString();
    }
    return sbc.toString();
}

public String replaceProperty(String plan,String subject,String condition) throws Exception {
    String regex = "\\{(.+?)}";
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(condition);
    StringBuffer sbc = new StringBuffer();
    while (matcher.find()){
        String id = LoyaltyConfig.findIdByProperty(plan,subject,matcher.group(1));
        matcher.appendReplacement(sbc,"{" + id + "}");
    }
    matcher.appendTail(sbc);
    return sbc.toString();
}