java - 如何在包含单个点或句点的文件中获取单词？

Question

我想从下面名为“query”的文件中查找表名和列名。

var query = "  SELECT accounts.name, SUM((COALESCE((jan_val_c),0)+  ";
query += "  COALESCE((feb_val_c),0)+ COALESCE((march_val_c),0)+ COALESCE((apr_val_c),0)+ ";
query += "  COALESCE((may_val_c),0)+ COALESCE((june_val_c),0)+ COALESCE((july_val_c),0)+   ";
query += "  COALESCE((aug_val_c),0)+ COALESCE((sept_val_c),0)+ COALESCE((oct_val_c),0)+   ";
query += "  COALESCE((nov_val_c),0)+ COALESCE((dec_val_c),0))) AS sales_plan,SUM((COALESCE((jan_actual_val_c),0)+   ";
query += "  COALESCE( (feb_actual_val_c),0)+ COALESCE( (march_actual_val_c),0)+ COALESCE( (apr_actual_val_c),0)+   ";
query += "  COALESCE( (may_actual_val_c),0)+ COALESCE( (june_actual_val_c),0)+ COALESCE( (july_actual_val_c),0)+   ";
query += "  COALESCE( (aug_actual_val_c),0)+ COALESCE( (sept_actual_val_c),0)+ COALESCE( (oct_actual_val_c),0)+   ";
query += "  COALESCE( (nov_actual_val_c),0)+ COALESCE( (dec_actual_val_c),0))) AS Actual_plan ,month_name_c,  ";
query += "   cl_sales_planning_month.year_c, cl_products.volume,cl_brands.name AS brand ,cl_therapies.name   ";
query += "   AS therapy,cl_products.name AS product, accounts.created_by,accounts.assigned_user_id ,   ";
query += "   DATE_FORMAT(STR_TO_DATE(CONCAT_WS('-',cl_sales_planning_month.month_name_c,  ";
query += "   cl_sales_planning_month.year_c),'%M-%Y'),'%b-%y' ) AS monthyear FROM cl_sales_planning_month   ";
query += "   LEFT JOIN accounts ON cl_sales_planning_month.account_id_c =accounts.id LEFT JOIN cl_products   ";
query += "   ON cl_sales_planning_month.cl_products_id_c = cl_products.id LEFT JOIN cl_brands ON   ";
query += "   cl_products.cl_brands_id_c=cl_brands.id LEFT JOIN cl_therapies ON   ";
query += "   cl_products.cl_therapies_id_c=cl_therapies.id WHERE   ";
 query += "            cl_sales_planning_month.month_name_c = MONTHNAME(CURRENT_DATE - INTERVAL 2 MONTH) AND  ";
      query += "            cl_sales_planning_month.year_c = YEAR(CURRENT_DATE - INTERVAL 2 MONTH)  AND";

query += "   cl_sales_planning_month.user_id_c IN ("+ params["childs"].value +") ";
query += "   GROUP BY therapy,monthyear   ";
query += "   ORDER BY STR_TO_DATE(cl_sales_planning_month.year_c,'%Y') ASC,   ";
query += "  STR_TO_DATE(cl_sales_planning_month.month_name_c,'%M') ASC, Actual_plan DESC   "; 

为此我编写了一个 Java 程序:

package com.waprau;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.regex.Pattern;

public class SeparateTableNamesColumnNames {
    public static void main(String[] args) {
        File file = new File("/home/waprau/Desktop/query");
        //Pattern = new Pattern("([^\\s]+(\\.(?i))$)");

        try {
            Scanner scanner = new Scanner(file);
            scanner.useDelimiter("\\s|=|,|\\)|\\(|this.|\\].");

            while(scanner.hasNext()){
                if(scanner.next().matches("(?<!\\.)\\b[a-zA-Z]\\w*\\.[a-zA-Z]\\w*\\b(?!\\.)"))
                 System.out.println(scanner.next());;
               }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

通过上面的程序，我能够分离所有的单词。但我只想得到那些包含单个点或句点的单词，例如accounts.name、cl_sales_planning_month.year_c、cl_products.volume、cl_brands.name、cl_therapies.name 等。但是我无法找到可以将这些词与文件分开的模式或任何内容。

但它不起作用。

这是我得到的结果:

这就是我想要的:

感谢任何帮助。

Answer 1

要匹配包含点的单词，您可以使用:"\\w+\\.\\w+"?

\w 匹配字母、数字和下划线。

但是，这也可以匹配具有多个句点的内容。您可以通过使用环视来改进它，以确保在您匹配的单词之前或之后没有其他句点:

"(?<!\\.)\\b\\w+\\.\\w+\\b(?!\\.)"

这匹配一个包含点的单词，并且不能紧接在其前后包含一个点。 \b 是一个单词边界。

但是，这会匹配像 123.45 这样的十进制数字。表格可以包含数字，但不能以 1 开头。所以我们也可以确保每个单词都以字母开头:

"(?<!\\.)\\b[a-zA-Z]\\w*\\.[a-zA-Z]\\w*\\b(?!\\.)"