Find String by part of string

Question

Is it possible to find line in file by part of it

As example:

I'm the good boy
I'm the bad boy
I'm the really good boy

Can i find the line by searching I'm the boy without writing good or bad

i need to catch the three lines

i tried

str = "iam good boy"
if "iam boy" in str:
    print ("yes")
else:
    print ("no")

There are two lines. Which one do you want to find?

Thavas Antonio
– Thavas Antonio

2021-05-17 00:32:36 +00:00
Commented May 17, 2021 at 0:32 — Thavas Antonio
– Thavas Antonio, Commented May 17, 2021 at 0:32
No, this won't work. in only works on exact substrings.

John Gordon
– John Gordon

2021-05-17 00:32:45 +00:00
Commented May 17, 2021 at 0:32 — John Gordon
– John Gordon, Commented May 17, 2021 at 0:32
@BuddyBob i need to find both

PytHOnAsk
– PytHOnAsk

2021-05-17 00:37:57 +00:00
Commented May 17, 2021 at 0:37 — PytHOnAsk
– PytHOnAsk, Commented May 17, 2021 at 0:37

enzo · Accepted Answer · 2021-05-17 01:18:51Z

1

Using RegEx, you can do something like this:

import re

strs = (
    "I'm the good boy",
    "I'm the good girl",
    "I'm the bad boy",
    "I'm the really good boy")
    
for s in strs:
    if re.match("I'm the .+ boy", s):
        print("Yes, it is, yeah")
    else:
        print("It's actually not")

prints

Yes, it is, yeah
It's actually not
Yes, it is, yeah
Yes, it is, yeah

edited May 17, 2021 at 1:18

answered May 17, 2021 at 0:39

enzo

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2 Comments

PytHOnAsk Over a year ago

I have file with thousand of lines, is there anyway to find the lines withour specifying \\w+ because i don't know where exactly be the missing word ?

enzo Over a year ago

You can replace \\w+ with .+. I've updated my answer.

Party-with-Programming · Accepted Answer · 2021-05-17 00:45:45Z

Here is what I found worked.

I had a text file, which had these two lines (which I understand you have):

I'm the good boy
I'm the bad boy

The I wrote this (with comments to explain how it works):

with open("testing.txt", 'r') as file:#Open the text file, do stuff and then close it when done
    row_counter = 0
    for row in file: #Go through each line in the file
        row_counter +=1
        if "I'm the" in row: #Check to see if a line in your file if it has "I'm the"
            if "boy" in row: #Narrows down to find a line that also contains "boy"
                print(f"Line {row_counter}") #In forms you which line(s) have "I'm the" and "boy" in them

The output is:

Line 1
Line 2

meaning both lines in the text file have "I'm the" and "boy" in them.

programandoconro · Accepted Answer · 2021-05-17 01:05:58Z

0

You can accomplish it using re.search to find the match. Also enumerate to keep the index and only return yes is all matches occur.

import re
stro = "iam good boy"
target = "iam boy"

def finder():
    for i,e in enumerate(target.split()):
        if re.search(e, stro):
            if  i == len(target.split()) - 1:
                return("yes")  
        else:
            return("no") 
  
finder()
# Yes

answered May 17, 2021 at 1:05

programandoconro

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