Question

In java I am trying to extract column names and their values using Regex and Matcher but dont know what I am doing wrong here.

    String sql = "INSERT INTO MyTable (column1, column2, column3, column4, column5 ) VALUES (1, 'Hi', 'A,B', '', null)";
    String pattern = "INSERT INTO.*((\\w)+).*\\((.*)\\).*VALUES.*\\((.*)\\)";

    Pattern r = Pattern.compile(pattern);

    Matcher m = r.matcher(sql);
    if (m.find()) {
        System.out.println("Found value: " + m.group(0));
        System.out.println("Found value: " + m.group(1));
        System.out.println("Found value: " + m.group(2));
    } else {
        System.out.println("NO MATCH");
    }

Expectation:

Group-1 = column1, column2, column3, column4, column5
Group-2 = 1, 'Hi', 'A,B', '', null

Answer 1

请勿在正则表达式中使用贪心.*。你可以使用这个正则表达式：

\bINSERT\s+INTO\s+\S+\s*\(([^)]+)\)\s*VALUES\s*\(([^)]+)\)

在Java中：

String regex = "\\bINSERT\\s+INTO\\s+\\S+\\s*\\(([^)]+)\\)\\s*VALUES\\s*\\(([^)]+)\\)";

这将给出：

Group 1: "column1, column2, column3, column4, column5 "
Group 2: "1, 'Hi', 'A,B', '', null"

RegEx Demo

Answer 2

试试这个

"INSERT INTO.*\\((.*)\\).*VALUES.*\\((.*)\\)"

你所犯的错误并没有逃避括号。没有逃脱\（正则表达式假设你正在开始一个小组。

Regex to extract column name and values not working

2 个答案: