正则表达式获取捕获组的最后一个字符以外的所有内容答案

【问题标题】：Regex to get everything but last chars of capture group正则表达式获取捕获组的最后一个字符以外的所有内容
【发布时间】：2022-12-04 12:28:27
【问题描述】：

How do I use regex to select everything before last 4 char in a capture group?

Example:

String str = \"{Index1=StudentData(studentName=Sam, idNumber=321231312), Index2=StudentData(studentName=Adam, idNumber=5675), Index3=StudentData(studentName=Lisa, idNumber=67124)}\";
String regex = \"(?<=idNumber=)[a-zA-Z1-9]+(?=\\))\";

System.out.println(str.replaceAll(regex, \"*\"));

Current output:

{Index1=StudentData(studentName=Sam, idNumber=*), Index2=StudentData(studentName=Adam, idNumber=*), Index3=StudentData(studentName=Lisa, idNumber=*)}

Desired output:

{Index1=StudentData(studentName=Sam, idNumber=*****1312), Index2=StudentData(studentName=Adam, idNumber=5675), Index3=StudentData(studentName=Lisa, idNumber=*7124)

标签： java regex regex-lookarounds regex-group

【解决方案1】：

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