Extract characters between two patterns using python

Extract characters between two patterns using python

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I have a file which has many line, and I want to extract these info in a list = ['sheep','cow','buffalo']

animal wild -list {
    tiger lion hyena
}
aaaa 
bbbb 
cccc 
animal domesticated_0 -list {
    sheep
}
dddd 
animal domesticated_1 -list {
    cow buffalo
}
eeee

I am using the code below but it is far from what I wanted.

temp_list = ['domesticated_0','domesticated_1']
start = False

for i in temp_list:
   for line in file:   
      if start:
         f1.write(line)
         if li.endswith("}"):
            start = False
      elif not li.startswith("animal"):
         start = False
      elif li.startswith("animal") and i in line:
         f1.write(line)
         start = True
         if li.endswith("}"):
            start = False

This solutions uses a regular expression:

(?:\banimal\s+domesticated_[01]\s+-list\s+{\s*)((?:\b\w+\b(?:\s*))+)(?:})
  1. (?:\banimal\s+domesticated_[01]\s+-list\s+{\s*) matches animal on a word boundary followed by one or more spaces followed by domesticated_ followed by either a 0 or 1 followed by one or more spaces followed by -list followed by one or more spaces followed by { followed by 0 or mores spaces, all in a non-capturing group.
  2. ((?:\b\w+\b(?:\s*))+) matches 1 or more occurrences of a word on a word boundary followed by 0 or more spaces (Group 1).
  3. (?:}) matches } in a non-capturing group.

After a string of animals is captured by the above regex, for example 'cow bufallow ', trailing spaces are removed and the string is split on spaces and appended to a list of animals:

The code:

import re

text = """
animal   wild  -list  {
                            tiger
                           lion
                          hyena
         }
aaaa
bbbb
cccc
animal   domesticated_0  -list  {sheep}
dddd
animal   domesticated_1  -list  {
                            cow
                           buffalo
         }
eeee """

animals = []
for m in re.finditer(r'(?:\banimal\s+domesticated_[01]\s+-list\s+{\s*)((?:\b\w+\b(?:\s*))+)(?:})', text):
    animals.extend(re.split(r'\s+', m.group(1).strip()))
print(animals)

Prints:

['sheep', 'cow', 'buffalo']

You can and should replace the regex with:

(?:\banimal\s+domesticated_\d+\s+-list\s+{\s*)((?:\b\w+\b(?:\s*))+)(?:})

if domesticated_ can be followed by any number besides 0 and 1.

See Demo

Find string between two substrings, Using regular expressions - documentation for further reference In python, extracting substring form string can be done using findall method� Need to get 2 sub-strings from strings. The two sub-strings are separated by multiple characters including special characters like colons and dollar signs, etc. The two sub-strings have their speci


This sounds like a job for regular expressions to me.

I would do something like this:

# Example of input
txt = """

animal   wild  -list  {
                            tiger
                           lion
                          hyena
         } 
aaaa
bbbb
cccc
animal   domesticated_0  -list  {sheep}  
dddd
animal   domesticated_1  -list  {
                            cow
                           buffalo
         }
eeee 
"""

import re

animals = re.findall("animal\s+domesticated_\d\s+-list\s+[{]\s*([^},]+)+\s*[}]", txt)
animals = [a.strip() for a in "\n".join(animals).split("\n") if len(a.strip()) > 0]
print(animals)

The code above outputs: ['sheep', 'cow', 'buffalo']

How to extract the substring between two markers?, Regular expressions are a bit overkill for this, so I suggest to take something smaller than regex, like the built in pattern match of Lua. Lua as a hole including the� First, import the re module -- it's not a built-in -- to where-ever you want to use the expression. Then, use re.search (regex_pattern, string_to_be_tested) to search for the pattern in the string to be tested. This will return a MatchObject which you can store to a temporary variable.


I just did a brute force solution without using regex

a="""animal   wild  -list  {
                            tiger
                           lion
                          hyena
         } 
aaaa
bbbb
cccc
animal   domesticated_0  -list  {sheep}  
dddd
animal   domesticated_1  -list  {
                            cow
                           buffalo
         }
eeee """
temp_list = ['domesticated_0','domesticated_1']
output = []


def getcontent(index,content):
  temp_answer = []
  while(index < len(content)):
    temp_answer.append(content[index])
    if '}' in content[index]:
      break
    index+=1
  answerwithbrackets = ''.join(temp_answer)
  index1=answerwithbrackets.index('{')
  index2=answerwithbrackets.index("}")
  return [answerwithbrackets[index1 + 1:index2 ].split(),index]



index =0
content = a.split('\n')
while (index < len(content)):
  for word in temp_list:
    if word in content[index]:
      tempoutput =getcontent(index,content)
      index = tempoutput[1]
      output.extend(tempoutput[0])
  index+=1
print(output)

OUTPUT

['sheep', 'cow', 'buffalo']

In Python, in a string, how can you grab all the text between two , In this simple tutorial I will show you how we can extract a text in a string that exists between Duration: 0:58 Posted: Aug 27, 2017 Question: Tag: python,regex,python-3.x I am working on a hobby project where I need to extract certain info between two substrings and there may be more than one occurrence.


Find text between two characters in Python, Simple python script to extract sub string between two delimiters of a string. You can also customize this code to extract the string between two special characters or two sub strings. Note: This code is written in Python 2 Python 3 string objects have a method called rstrip (), which strips characters from the right side of a string. The English language reads left-to-right, so stripping from the right side removes characters from the end.


Extract string between two delimiters- GetHowStuff, For simple cases, this could also be solved with a regular expression. Extract Values between two strings in a text file using python � printing lines between start� Extract text from a file between two markers. extraction. file. A common approach to this is using a state machine that reads the text until the <START> marker is encountered, then starts a “recording mode”, and extracts the text until the <END> marker is encountered. This process can repeat if multiple sections may appear in the file and have to be extracted.


Extract text from a file between two markers, For basic manipulation of strings, Python's built-in string methods can be The only difference between find() and index() is their behavior when the search string is '1--2--3'. A common pattern is to use the special character "\n" (newline ) to we have learned how to extract values from strings, and to manipulate strings� You can also specify a range of characters using -inside square brackets. [a-e] is the same as [abcde]. [1-4] is the same as [1234]. [0-39] is the same as [01239]. You can complement (invert) the character set by using caret ^ symbol at the start of a square-bracket. [^abc] means any character except a or b or c. [^0-9] means any non-digit