Question

我的文本中带有SAS代码。本质上，它是在

之间包装的SQL查询

    PROC SQL;
    .
    .
    .
    .
    .
    QUIT;

我试图将两者之间的SQL提取为单个匹配项。

这是我的文本文件的外观

***logic 1***
proc sql;
 create table Combined as
  select t1.name, t2.units
  from mdweop.candy_customers_azim_056 as t1
  inner join mdweop.candy_sales_history_set  t2 on (t1.custid = t2.ORIGTN_ACCT_NO);
quit;

***logic 2***
PROC SQL;
 CREATE TABLE COMBINED AS
  SELECT T1.RPOG_HMDA_CODES, T2.RSN_DECL1_C
  FROM MDWEOP.CANDY_CUSTOMERS AS T1
  INNER JOIN MDWEOP.CANDY_SALES_HISTORY AS T2
    ON (T1.CUSTID = T2.ACA_MISC_Z03HMDA_BV);
QUIT;

***logic 3***
PROC SQL;
 CREATE TABLE COMBINED AS
  SELECT T1.RRG_PRPS_CODES, T2.RSN_DECL1_C
  FROM MDWEOP.CANDY_CUSTOMERS AS T1
  INNER JOIN MDWEOP.CANDY_SALES_HISTORY AS T2
    ON (T1.CUSTID = T2.ACA_MISC_Z03HMDA_BV);
QUIT;

我尝试了这个regex，但它发现每一行都是单个匹配项。

理想情况下，如果我想从文本文件中提取每个SQL查询

任何潜在客户都很受赞赏。

Answer 1

我怀疑这是否可以解决您真正的问题以获得SQL？，但是我已经按照您的正则表达式演示发布了此答案。

const regex = /START-OF-FIELDS[\r\n]+(.*)[\n\r]+(.*)[\n\r](.*)[\n\r]END-OF-FIELDS/img;
const str = `START-OF-FIELDS
Line A
Line B
Line C
END-OF-FIELDS`;
let m;
const sql_lines = []
while ((m = regex.exec(str)) !== null) {
  // This is necessary to avoid infinite loops with zero-width matches
  if (m.index === regex.lastIndex) {
    regex.lastIndex++;
  }

  // The result can be accessed through the `m`-variable.
  m.forEach((match, groupIndex) => {
    if (groupIndex > 0) {
      sql_lines.push(match);
    }
  });
}

console.log(sql_lines)

Answer 2

您可以在正则表达式中添加s修饰符，以使.字符也可以匹配换行符，而i可以匹配大小写。还可以使用非捕获组作为前缀和后缀：

/^(?:START\-OF\-FIELDS)(.*)(?:END\-OF\-FIELDS)$/mgsi

See it in action here

正则表达式提取Javascript中两个字符串之间的行

2 个答案: