Python 从具有重复嵌套模式的文本文件中提取文本

这里有一个没有正则表达式的选项，只有一些字符串和列表操作.有点复杂，但它可以工作:

kds = """[Dataset 1] "text1" [Filename 1] "text2" [Filename 2] "text3" [Key Data Delimiter] !key data1![Key Data Delimiter] "text4" [Filename 3] "text5" [Dataset 2] "text6" [Filename 1] [Key Data Delimiter] key data2 [Key Data Delimeter] "text7" [Filename 2]"""

# split the text file into datasets
nkds = kds.replace('[Dataset','xxx[Dataset').split('xxx')

for k in nkds[1:]:
    entry = ''
    #split each dataset into components
    nk = k.replace('[','xxx[').split('xxx')[1:]
    #get the name of the dataset
    entry+= nk[0].replace(']',']xxx').split('xxx')[0]
    for k in nk:
        #find the index position of the delimiter in the dataset list
        if '[Key Data Delimiter]' in k:
            #get the previous index position for the file name
            file_ind = nk.index(k)-1
            entry+= nk[file_ind].replace(']',']xxx').split('xxx')[0]
            entry+= k.split(']')[1].strip()
            break
    print(entry)

输出:

[Dataset 1][Filename 2]!key data1!
[Dataset 2][Filename 1]key data2