[英]substring extract in a file using Python Regex
A file has n number of lines in blocks of logically defined strings. 文件在逻辑定义的字符串块中具有n行。 I'm parsing each line and capturing the required data based on some matching conditions.
我正在解析每一行并根据一些匹配条件捕获所需的数据。
I have read through each line and finding the blocks with this code: 我已阅读每一行并使用以下代码查找块:
#python
for lines in file.readlines():
if re.match(r'block.+',lines)!= None:
block_name = re.match(r'block.+', lines).group(0)
# string matching code to be added here
Input File: 输入文件:
line1 select KT_TT=$TMTL/$SYSNAME.P1
line2 . $dhe/ISFUNC sprfl tm/tm1032 int 231
line3 select IT_TT=$TMTL/$SYSNAME.P2
line4 . $DHE/ISFUNC ptoic ca/ca256 tli 551
.....
.....
line89 CALLING IK02=$TMTL/$SYSNAME.P2
line90 CALLING KK01=$TMTL/$SYSNAME.P1
Matching conditions & expected output of each step: 每个步骤的匹配条件和预期输出:
final output should be like 最终输出应该是这样的
FUNC SYS CALL
tm1032 int 231 $SYSNAME.P1 KK01
ca256 tli 551 $SYSNAME.P2 IK02
If all you need is the text next to the last slash, you need not go for regex at all . 如果您只需要最后一个斜杠旁边的文本,则根本不需要使用正则表达式。
Simply use the .split("/")
on each line and you can get the last part next to the slash 只需在每一行上使用
.split("/")
就可以得到斜杠旁边的最后一部分
sample = "$dhe/ISFUNC sprfl tm/tm1032 int 231"
sample.split("/")
will result in 会导致
['$dhe', 'ISFUNC sprfl tm', 'tm1032 int 231']
and then just access the last element of the list using -1 indexing to get the value 然后使用-1索引来访问列表的最后一个元素以获取值
PS : Use the split function once you have found the corresponding line PS:找到相应的行后使用拆分功能
While reading the lines, match the word "/ISFUNC" and fetch the characters from the last till it matches a "/" and save it to a variable.
在读取行时,匹配单词“/ ISFUNC”并从最后一个字符中取出字符,直到它与“/”匹配,并将其保存到变量中。 Expected o/p->tm1032 int 231 (matching string found in line2)
预期o / p-> tm1032 int 231(在第2行中找到匹配的字符串)
char_list = re.findall(r'/ISFUNC.*/(.*)$', line)
if char_list:
chars = char_list[0]
Once ISFUNC is found, read the immediate previous line and fetch the data from that line, start form the last character till it matches a "/" and save it to a variable.
找到ISFUNC后,读取前一行并从该行获取数据,从最后一个字符开始,直到与“/”匹配,并将其保存到变量中。 Expected o/p->$SYSNAME.P1 (line 1)
预期o / p - > $ SYSNAME.P1(第1行)
The ideal approach here is to either (a) iterate through the list indices rather than the lines themselves (ie for i in range(len(file.readlines()): ... file.readlines()[i]
) or (b) maintain a copy of the last line (say, put last_line = line
at the end of your for loop. Then, reference that last line for this expression: 这里理想的方法是(a)迭代列表索引而不是行本身(即
for i in range(len(file.readlines()): ... file.readlines()[i]
)或( b)维护最后一行的副本(比如,在for循环的末尾放置last_line = line
。然后,引用该表达式的最后一行:
data_list = re.findall(r'/([^/]*)$', last_line)
if data_list:
data = data_list[0]
Continue reading the lines down and look for the line starting with "CALLING" and the last string after "/" should match with o/p of step 2($SYSNAME.P1).
继续读取这些行并查找以“CALLING”开头的行,“/”后的最后一个字符串应与步骤2的o / p匹配($ SYSNAME.P1)。 Just capture the data after CALLING word and save it.
只需在CALLING字后捕获数据并保存即可。 expected o/p -> KK01 (line 90)
预期o / p - > KK01(第90行)
Assuming, from your example, you mean "just the data immediately after (ie up until the equals sign): 假设,从您的示例中,您的意思是“只是紧跟在之后的数据(即直到等号):
calling_list = re.findall(r'CALLING(.*)=.*/' + re.escape(data) + '$', line)
if calling_list:
calling = calling_list[0]
You can move the parentheses around to change what from that line exactly you want to capture. 您可以移动括号以更改要从该行捕获的内容。
re.findall()
will output a list of matches, including only the bits inside the parentheses that were matched. re.findall()
将输出匹配列表,仅包括匹配的括号内的位。
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