Replace a particular substring in a list of string with another substring

Question

I am taking an example scenario for my question. If I have a list of URLs :

url_list=["https:www.example.com/pag31/go","https:www.example.com/pag12/go","https:www.example.com/pag0/go"]

I want to replace the substring in between ".com/" and "go"

For Eg. new url should look like

['https:www.example.com/home/go','https:www.example.com/home/go','https:www.example.com/home/go']

I have tried slicing and replacing based on index but couldn't get the required result for the whole list.

Any help is really appreciated. Thanks in advance.

PacketLoss · Accepted Answer · 2020-09-25 05:51:59Z

You can use regex sub() and list comprehension to apply your logic to every element of your list.

import re

url_list=["https:www.google.com/pag31/go","https:www.facebook.com/pag12/go","http:www.bing.com/pag0/go"]

pattern = r'(?<=com\/).*(?=\/go)'

result = [re.sub(pattern, 'home', url) for url in url_list]

This will match against any string where a value is found between com/ and /go. This will also ensure that we capture any website, regardless of http(s).

Output:

['https:www.google.com/home/go', 'https:www.facebook.com/home/go', 'http:www.bing.com/home/go']

Regex Explanation

The pattern r'(?<=com\/).*(?=\/go)' looks for the following:

(?<=com\/): Positive lookbehind to check if com/ prefixes our lookup

.*: Matches anything an infinite amount of times

(?=\/go): Positive look ahead to check if /go directly occurs after .*

This enables us to match any string between the positive checks. You can find a more in-depth explanation on the pattern here

Sparrow · Accepted Answer · 2020-09-25 05:39:02Z

1

You can try using regular expressions of python.

import re
re_url ="https:www.example.com/.*/go"
url = "https:www.example.com/home/go"
url_list_new= [re.sub(re_url,url,x) for x in url_list]
url_list_new

Output:

 ['https:www.example.com/home/go',
 'https:www.example.com/home/go',
 'https:www.example.com/home/go']

answered Sep 25, 2020 at 5:39

Sparrow

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2 Comments

PacketLoss Over a year ago

This will only work against the example the poster has listed. If any other URL other then example are in the list, or even a http url it will not match.

Sparrow Over a year ago

@PacketLoss yes right. I missed that thing, thanks for pointing out.

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