CODEWITHSUNDEEP
pythonstringpython-2.7split
sunny
sunny

Reputation: 159

How to find a part of string in another string?

I need to read data from the file.

f=open("essay.txt","r")
my_string=f.read()

The below string which starts with \nSubject: and ends with \n is in the my_string

Example:
"\nSubject: Good morning - How are you?\n"

How can I search for the string which starts with \nSubject: and ends with \n ? Is there any python function to search for particular pattern of a string ?

Upvotes: 0

Views: 159

Answers (2)

Mr_Spock
Mr_Spock

Reputation: 3835

Try startswith().

str = "Subject: Good morning - How are you?\n"

if str.startswith("Subject"):
    print "Starts with it."

Upvotes: 2

jamylak
jamylak

Reputation: 133534

It's better to just search through the file line by line instead of loading it all into memory with .read(). Every line ends with \n, no line starts with it:

with open("essay.txt") as f:
    for line in f:
        if line.startswith('Subject:'):
            pass

To search for it in that string:

import re
text = "\nSubject: Good morning - How are you?\n"
m = re.search(r'\nSubject:.+\n', text)
if m:
    line = m.group()

Upvotes: 4

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