How do I extract an email id from a file using 'regular expressions'?

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I want to extract an email id from a text 'file' using 'Regular Expressions'.

Is there a way to feed a file as input, use the relevant regular expression, & get an email id from it?

What I have tried:

#Extracting email Ids
email_pattern='[a-z0-9A-Z_]*@[a-z0-9A-Z]*\.[a-zA-Z]*'
email_match=re.findall(email_pattern, e_text) 
print(email_match)

This code prints the email id only when 'e_text' is fed with sentences directly. When I give a text file 'path' in place of 'e_text', the output is an empty list--> []

Posted 8-Sep-22 1:12am

Apoorva 2022

Updated 8-Sep-22 2:26am

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Richard MacCutchan · Answer 1 · 2022-09-08T01:47:00

Solution 1

You cannot use a filename for the scond parameter to the re — Regular expression operations — Python 3.10.7 documentation[^] findall function. You need to read the contents of the file and use the resulting text. See 7. Input and Output — Python 3.10.7 documentation[^].

Posted 8-Sep-22 1:47am

Richard MacCutchan

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Apoorva 2022 10-Sep-22 13:57pm

Thanks. The documentation is very helpful.

OriginalGriff · Answer 2 · 2022-09-08T02:26:00

To add to what Richard has said ... Email validation is pretty complicated, and your regex is far too simplistic - it allows illegal addresses such as "@." and doesn't find legal addresses such as "a.b@x.com", "a@x.co.uk", "a@x-y.com", and so forth.

To "find an email address" somewhere in a bunch of text is complicated, even if you allow all the valid characters in such an address - which can include spaces, quote and double quote, backslash, ... and even '@' can be part of your local or domain section if quoted! Email address - Wikipedia[^]
Why complicated? Because emails addresses are text, and even if you stick to a subset of valid characters (and that'll annoy a lot of people) it's next to impossible to tell is any given chunk of text that includes an '@' somewhere in it is actually intended to be an email address reliably.

I'd strongly suggest that you take a close look at your input file and see if you can identify anything which identifies "this is an email address" before the address and "that was an email address" after it:

Email: me@mycompany.com

For example makes it easier: you have a lead in "Email: ", and a newline to terminate.

Without that, you are going to get a lot of false positives, as well as bad detecs of partial email addresses.

Apoorva 2022 · Answer 3 · 2022-09-10T08:05:00

I found the solution through the 'tika' library. Here's the code -->

Extracting text from '.docx' file (Works for pdf as well)

Python

from tika import parser

file = r'../content/drive/My Drive/foldy folder/resume.docx'
file_data = parser.from_file(file)
text = file_data['content']
print(text)

Extracting email Ids

Python

email_pattern='[a-z0-9A-Z_]*@[a-z0-9A-Z]*\.[a-zA-Z]*'
email_match=re.findall(email_pattern, text) 
print(email_match)

NOTE: Coded in Google Colab

How do I extract an email id from a file using 'regular expressions'?

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How do I extract an email id from a file using 'regular expressions'?

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