Question

这是我的测试示例

JT  - American journal of public health
JID - 1254074
SB  - AIM
SB  - IM
MH  - Adult
MH  - Biomedical Research/*organization & administration
MH  - Female
MH  - Health Care Reform/*history/*methods
AB  - OBJECTIVES: We assessed whether a 2-phase labeling and choice 
AB-  architecture intervention
OWN - NLM
STAT- MEDLINE
DCOM- 20120417
LR  - 20170220
IS  - 1541-0048 (Electronic)

在所有行以“MH”开头后，如何编写正则表达式以仅识别词汇表，然后将它们导入excel表。输出应该是这样的：

[Adult, Biomedical Research, organization & administration, Female, Health Care Reform, history, methods].

这是我的尝试：

import re
Path = "MH\s*.*" 
re.findall(Path,file)

我知道这是错的，但我不知道如何解决它。

谢谢

Answer 1

使用re.findall

<强>演示：

import re
s = """JT  - American journal of public health
JID - 1254074
SB  - AIM
SB  - IM
MH  - Adult
MH  - Biomedical Research/*organization & administration
MH  - Female
MH  - Health Care Reform/*history/*methods
AB  - OBJECTIVES: We assessed whether a 2-phase labeling and choice 
AB-  architecture intervention
OWN - NLM
STAT- MEDLINE
DCOM- 20120417
LR  - 20170220
IS  - 1541-0048 (Electronic)"""

res = []
for i in re.findall(r"MH\s+-\s+(.*)", s, flags=re.MULTILINE):
    res.extend(i.split("/*"))
print( res )

<强>输出：

['Adult', 'Biomedical Research', 'organization & administration', 'Female', 'Health Care Reform', 'history', 'methods']

Answer 2

看起来您需要执行一些正则表达式，因为您还希望在某些行上拆分/ *。这应该可以做到！

import re

my_file = """JT  - American journal of public health
JID - 1254074
SB  - AIM
SB  - IM
MH  - Adult
MH  - Biomedical Research/*organization & administration
MH  - Female
MH  - Health Care Reform/*history/*methods
AB  - OBJECTIVES: We assessed whether a 2-phase labeling and choice
AB-  architecture intervention
OWN - NLM
STAT- MEDLINE
DCOM- 20120417
LR  - 20170220
IS  - 1541-0048 (Electronic)"""

my_list = my_file.splitlines()

new_list = []

for item in my_list:
    if re.search("^MH\s*-", item):
        item = re.sub("[^-]+-\s*", "", item)
        item = item.split("/*")
        new_list = new_list + item

print(new_list)

输出：

['Adult', 'Biomedical Research', 'organization & administration', 'Female', 'Health Care Reform', 'history', 'methods']

我将该字符串放入列表中。我认为你很有可能在导入时将该字符串作为列表。我也喜欢使用正则表达式一次使用1行，以后更容易进行故障排除。

我匹配以MH开头然后捕获它们的项目。然后我将每个项目拆分为/*并将所有这些项目放在一个可用于excel导出的好列表中。

Answer 3

只需发布我尝试的代码，然后注意到编写更好的答案时发布了请不要判断。这恰好发生在SO上。

s = """
JT  - American journal of public health
JID - 1254074
MH  - Adult
MH  - Biomedical Research/*organization & administration
MH  - Health Care Reform/*history/*methods
AB  - OBJECTIVES: We assessed whether a 2-phase labeling and choice
"""

import re
import itertools
matches = re.findall(r"^MH[\s-]+(.*)$", s, re.MULTILINE)
splitmatches = [i.split(r"/*") for i in matches]
flattenedmatches = list(itertools.chain(*splitmatches))

print(flattenedmatches)

<强>输出：

['Adult', 'Biomedical Research', 'organization & administration', 'Health Care Reform', 'history', 'methods']

使用正则表达式查找模式

3 个答案: