获取嵌套括号中的所有文本（Python）

我正在尝试提取我的

.txt

文件中嵌套括号中的所有字符串（以及括号本身）。请参阅我在本例中使用的示例

.txt

文件

我已经尝试并编写了三种不同的代码，但它们似乎都无法提取所有嵌套的括号。它们只能提取嵌套括号的一部分。任何关于我做错了什么的建议都会很有帮助

以下是我迄今为止完成的三个代码：

• 第一次尝试：

输出：

['"xE\'", PUT(xx.xxxx.),"\'"', '"TRUuuuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.", '"xE\'", PUT(xx.xxxx.),"\'"', '"CUuuiiiiuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]

[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"TRUuuuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]
[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"CUuuiiiiuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]

['kkkkk;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"TRUuuuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(\n']
['SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );\n']
['\n']
['\n']
['jjjjjj;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"CUuuiiiiuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );']

• 第二次尝试：

输出：

['"xE\'", PUT(xx.xxxx.),"\'"', '"TRUuuuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.", '"xE\'", PUT(xx.xxxx.),"\'"', '"CUuuiiiiuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]

[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"TRUuuuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]
[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"CUuuiiiiuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]

['kkkkk;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"TRUuuuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(\n']
['SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );\n']
['\n']
['\n']
['jjjjjj;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"CUuuiiiiuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );']

• 第三次尝试：

输出：

['"xE\'", PUT(xx.xxxx.),"\'"', '"TRUuuuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.", '"xE\'", PUT(xx.xxxx.),"\'"', '"CUuuiiiiuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]

[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"TRUuuuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]
[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"CUuuiiiiuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]

['kkkkk;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"TRUuuuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(\n']
['SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );\n']
['\n']
['\n']
['jjjjjj;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"CUuuiiiiuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );']

我无法获得的预期输出应该如下所示：

['"xE\'", PUT(xx.xxxx.),"\'"', '"TRUuuuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.", '"xE\'", PUT(xx.xxxx.),"\'"', '"CUuuiiiiuth"', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]

[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"TRUuuuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]
[['"xE\'"', ',', 'PUT', ['xx.xxxx.'], ',', '"\'"']]
[['"CUuuiiiiuth"']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'gff', '&jfjfsj_jfjfj.']]
[['xxx', ['xx_ix', 'as', 'format', "'xxxx-xx'"], 'lec', '&jgjsd_vnv.']]

['kkkkk;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"TRUuuuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(\n']
['SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );\n']
['\n']
['\n']
['jjjjjj;\n']
['\n']
['  select xx', ' jdfjhf:jhfjj from xxxx_x_xx_L ;\n', '"xE\'", PUT(xx.xxxx.),"\'"']
['quit; \n']
['\n']
['/* 1.xxxxx FROM xxxx_x_Ex_x */ \n']
['proc sql; ', ';\n', '"CUuuiiiiuth"']
['hhhjhfjs as fdsjfsj:\n']
['select * from djfkjd to jfkjs\n']
['(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj\n']
['\tFROM &xxx..xxx_xxx_xxE\n']
["where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and \n"]
['      ', ')\n', "xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv."]
[' );']

实施DarrylG的代码：

def parse(text):
    result = []
    parens_open = 0

    for char in text:
        if char == '(':
            parens_open += 1
            result.append(char)
        elif char == ')' and parens_open:
            parens_open -= 1
            result.append(char)
        elif char == '\n' and result and result[-1] != '\n':
            result.append(char)
        elif parens_open:
            result.append(char)

    return ''.join(result)


checkhere = set()               
checkhere.add("Select")
checkhere.add("From")
checkhere.add("select")
checkhere.add("from")
checkhere.add("SELECT")
checkhere.add("FROM")


with open('lan sample text file.txt', 'r') as fd:
    txt = fd.read()
    result = parse(txt)
    for chunk in parse(result):
        for x in checkhere:
            if x in chunk:
                print(chunk)    

---

以下代码输出与您最初的预期输出相同

def parse(text):
  result = []
  parens_open = 0

  for char in text:
    if char == '(':
      parens_open += 1
      result.append(char)
    elif char == ')' and parens_open:
      if parens_open == 1 and result[-1] == '(':
        result.pop()  # Removes empty unnested parens i.e. '()'
      else:
        result.append(char)
      parens_open -= 1

    elif char == '\n' and result and result[-1] != '\n':
      # ensure only one carriage return between text
      result.append(char)
    elif parens_open:
      result.append(char)

  return ''.join(result)

with open('test.txt', 'r') as fd:
  txt = fd.read()
  result = parse(txt)
  print(result)

输出

("xE'", PUT(xx.xxxx.),"'")
("TRUuuuth")
(
SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj
    FROM &xxx..xxx_xxx_xxE
where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))
 )
("xE'", PUT(xx.xxxx.),"'")
("CUuuiiiiuth")
(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj
    FROM &xxx..xxx_xxx_xxE
where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))(( ))
 )

(SELECT((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))
(SELECT
((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))

此代码用于更新有关检索特定字段的问题

def find_field(field, text):
  pattern = re.compile('\(\s*' + field, flags=re.IGNORECASE)
  matches = pattern.finditer(text)

  result = []
  for m in matches:
    s, e = m.span()
    parens_open = 0
    if result:
      result.append('\n(' + field)
    else:
      result.append('(' + field)

    for char in text[e+1:]: # skip field
      if char == '(':
        parens_open += 1
        result.append(char)
      elif char == ')' and parens_open:
        if parens_open == 1 and result[-1] == '(':
          result.pop()  # Removes empty parens
        else:
          result.append(char)
        parens_open -= 1
        if parens_open == 0:
          break         # end of field's enclosing left, right parens
      elif char == '\n' and result and result[-1] != '\n':
        result.append(char)
      elif parens_open:
        result.append(char)

  return ''.join(result)

# Test by retrieving select field
with open('test.txt', 'r') as fd:
  txt = fd.read()
  print(find_field("SELECT", txt))

输出

("xE'", PUT(xx.xxxx.),"'")
("TRUuuuth")
(
SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj
    FROM &xxx..xxx_xxx_xxE
where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))
 )
("xE'", PUT(xx.xxxx.),"'")
("CUuuiiiiuth")
(SELECT abc AS abc1, abc_2_ AS efg, abc_fg, fkdkfj_vv, jjsflkl_ff, fjkdsf_jfkj
    FROM &xxx..xxx_xxx_xxE
where ((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))(( ))
 )

(SELECT((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))
(SELECT
((xxx(xx_ix as format 'xxxx-xx') gff &jfjfsj_jfjfj.) and
      (xxx(xx_ix as format 'xxxx-xx') lec &jgjsd_vnv.))

---

谢谢你，DarrylG！我尝试了你的代码，它的工作结果是预期的！但假设我想在

结果中找到一些关键字（例如“选择”和“从”），这样我的最终输出就只有
（选择abc作为abc1，abc_2作为efg，abc_fg，fkdkfj_vv，jjsflkl_ff，fjkdsf_jfkj FROM&xxx..xxx_xxx，其中（（xxx（xx_ix作为格式'xxxx xx'）gff&jffffffjfj）和（xxx_ix作为格式'xxxx-xx'））lec&jgjsd（v.）（（））
。那怎么办？我试过了，但什么也印不出来。请滚动到我上面编辑的文章底部，查看我试图实现的代码@杰基——我在你的帖子底部没有看到任何编辑。无论如何，要过滤掉（tag……），其中tag可以是关键字，如“SELECT”或“FROM”，点对应于任何字符，并且“'）”是与tag相同级别的结尾参数？在本网页上按ctrl+f组合键DarrylG！-->实施DarrylG的code@jackie--我看到了。我去看看。非常感谢DarrylG！！我尝试了代码，也尝试了在文件中查找“FROM”，但它没有返回任何输出。“选择”怎么能做到？如果我想在文件中同时查找“SELECT”和“FROM”，因为我要查找两个字段，即“SELECT”和“FROM”，我是否应该将代码改为
pattern=re.compile（'\（\s*'+field+field，flags=re.IGNORECASE）
，意思是在该行代码中添加另一个
+field
？