CODEWITHSUNDEEP
pythonregex
user3479404
user3479404

Reputation: 29

Looking to find specific phrases in file using Python

I am aware that there are some quite similar posts about this on the forum but I need this for a quick scan of a text file. I have to run 500 checks through a 1 GB file and print out lines that contain certain phrases, here is my code:

import re
with open('text.txt', 'r') as f:
    searchstrings = ('aaAa','bBbb')
    for line in f.readlines():
        for word in searchstrings:
            word2 = ".*" + word + ".*"
            match = re.search(word2, line)
            if match:
                print word + "     " + line

I was trying to make it return any line containing those phrases, so even if the line was "BBjahdAAAAmm" I wanted it returned because it has aaaa in it. aaAa and bBbb are just examples, the list is completely different.

Upvotes: 1

Views: 60

Answers (2)

Sasori
Sasori

Reputation: 1

Do you mean IGNORECASE? Try re.search(word2, line, re.IGNORECASE).

Upvotes: 0

xvan
xvan

Reputation: 4875

Don't use f.readlines() You'll be loading the whole 1GB into memory. Read them one at a time.

Instead do:

searchstrings = ('aaAa','bBbb')
with open('text.txt', 'r') as f:
    for line in f:
        for word in searchstrings:
            if word.lower() in line.lower():
               print word + "     " + line

Upvotes: 2

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