Question

我正在尝试获取与特定字符串匹配的行之间的所有行，直到出现结束行。起始模式和结束模式可以在同一文件中的不同位置。我的意图是使多次出现之间的界限成行。基本上，我的文件可能像下面的

CREATE OR REPLACE TRIGGER "ckjsdnvjn" (ID number, Type varchar2)
  BEFORE UPDATE OR INSERT ON TRIGGER_NAME
  FOR EACH ROW
  BEGIN
IF INSERTING THEN
  :NEW.CREATED_D  := SYSTIMESTAMP;
ELSE
  :NEW.CREATED_D  := :OLD.CREATED_D;
END IF;
:NEW.MODIFIED_D := SYSTIMESTAMP;
  END;
/

CREATE TABLE kjjknvfskjn 
(
  ID NUMBER(19,0) NOT NULL,
  GRADE VARCHAR2( 4 ) NOT NULL,
  MODIFIED_D TIMESTAMP,

  CONSTRAINT jnflkvndflkn PRIMARY KEY( ID )
);

CREATE SEQUENCE kcnvlfnvlfnlk;

CREATE OR REPLACE TRIGGER ME(ticket varchar2, note varchar2) AS
BEGIN
  INSERT INTO jknsfjknv(
    cnkj,
    kknvlfn
  )
  VALUES (
    SYS_CONTEXT('lknvl','kvnldfkn'),
    '(kljkcsn: ' ||  lkdnv || ') ' || lknv
  );
END ME;
/

预期输出：

匹配1：

CREATE OR REPLACE TRIGGER "ckjsdnvjn" (ID number, Type varchar2)
  BEFORE UPDATE OR INSERT ON TRIGGER_NAME
  FOR EACH ROW
  BEGIN
IF INSERTING THEN
  :NEW.CREATED_D  := SYSTIMESTAMP;
ELSE
  :NEW.CREATED_D  := :OLD.CREATED_D;
END IF;
:NEW.MODIFIED_D := SYSTIMESTAMP;
  END;
/

匹配2：

CREATE OR REPLACE TRIGGER ME(ticket varchar2, note varchar2) AS
BEGIN
  INSERT INTO jknsfjknv(
    cnkj,
    kknvlfn
  )
  VALUES (
    SYS_CONTEXT('lknvl','kvnldfkn'),
    '(kljkcsn: ' ||  lkdnv || ') ' || lknv
  );
END ME;
/

我的伪代码如下，但是我没有得到第二条匹配行之间的行（CREATE OR REPLACE TRIGGER ME），因为还有附加的括号。有没有更好的方法来获得所需的输出？

    with open(local_file, 'r') as f:
        textfile_temp = f.read()
        lines = textfile_temp.splitlines()
        STRING = 'CREATE OR REPLACE TRIGGER'
        SEARCH_END_STRING = 'end;'
        for line in lines:
            if re.search(STRING, line, re.IGNORECASE):
                line = line.strip()
                line = line.replace('(', '\(')
                line = line.replace(')', '\)')
                print line
                SEARCH_PATTERN = r'(' + line + ')(.*?)(' + SEARCH_END_STRING + ')'
                SEARCH_REGEX = re.compile(SEARCH_PATTERN, re.IGNORECASE|re.DOTALL|re.MULTILINE)
                match = SEARCH_REGEX.search(textfile_temp)
                print match.group()

错误：

CREATE OR REPLACE TRIGGER ME\(ticket varchar2, note varchar2\) AS
AttributeError: 'NoneType' object has no attribute 'group'

Answer 1

使用re.findall-> Lookbehind & Lookahead

演示：

import re
for i in  re.findall(r"(?<=CREATE OR REPLACE).*?(?=\/)", s, flags=re.MULTILINE|re.DOTALL):
    print("CREATE OR REPLACE" + i)
    print("---")

输出：

 CREATE OR REPLACE TRIGGER "ckjsdnvjn" (ID number, Type varchar2)
  BEFORE UPDATE OR INSERT ON TRIGGER_NAME
  FOR EACH ROW
  BEGIN
IF INSERTING THEN
  :NEW.CREATED_D  := SYSTIMESTAMP;
ELSE
  :NEW.CREATED_D  := :OLD.CREATED_D;
END IF;
:NEW.MODIFIED_D := SYSTIMESTAMP;
  END;

----
 CREATE OR REPLACE TRIGGER ME(ticket varchar2, note varchar2) AS
BEGIN
  INSERT INTO jknsfjknv(
    cnkj,
    kknvlfn
  )
  VALUES (
    SYS_CONTEXT('lknvl','kvnldfkn'),
    '(kljkcsn: ' ||  lkdnv || ') ' || lknv
  );
END ME;

----

正则表达式查找开始和结束之间的所有行

1 个答案: