Non capturing look behind in regex python

Question

I want to extract net profit from the statement, with 'net profit' as the non capturing part. Not sure how to do it(may be a non capturing look behind?)

eg

'business venture of net profit 23.5 million dollars'

required o/p:

23.5 million

Applied the following regex:

(net|nt)\s*\.?\s*(profit|earnings)\s*\.?\s*\d+\.?\d*\.?\s*(?:lakh|crore|million)

But, it is giving

[('net', 'profit')]

as the output.

Yes, you have groups that capture. Did you look at the re module documentation and find the lookbehind assertion syntax ((?<=...)) yet? IIRC you can't use variable-width patterns (* specifically) in an assertion like that however. Perhaps you just wanted t omake the groups non-capturing (like the group you put after)? — Martijn Pieters
– Martijn Pieters, Commented May 15, 2017 at 7:02
You can use ne?t\s*\.?\s*(?:profit|earnings)\s*(\.?\s*\d+\.?\d*\.?\s*(?:lakh|crore|million)) — anubhava
– anubhava, Commented May 15, 2017 at 7:03

Abhishek Gurjar · Accepted Answer · 2017-05-15 07:10:20Z

2

Try with below regex you will get the result in group 1,

(?:ne?t\s(?:profit|earning)\s)([\d\.]+\s(?:million|laks|crore))

DEMO

answered May 15, 2017 at 7:10

Abhishek Gurjar

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Ludisposed · Accepted Answer · 2017-05-15 07:11:59Z

1

You didn't capture the digitgroup. Also you need a non-capturing group with the 'net' and 'profit'

so this should work:

Edit to capture million..etc

import re
s = 'business venture of net profit 23.5 million dollars'
re.findall(r'(?:net|nt)\s*\.?\s*(?:profit|earnings)\s*\.?\s*(\d+\.?\d*)\.?\s*(lakh|crore|million)', s)
# output: ['23.5', 'million']

Example at: https://regex101.com/r/EXCzeV/2

edited May 15, 2017 at 7:11

answered May 15, 2017 at 7:03

Ludisposed

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2 Comments

Aditya Kuls Over a year ago

how to include 'million' in the output?

Ludisposed Over a year ago

Remove the non-capturing group which corresponds to : (lakh|core|million)

akash karothiya · Accepted Answer · 2017-05-15 07:14:20Z

1

You can use (?:) for non-capture

s = 'business venture of net profit 23.5 million dollars'
re.findall(r'(?:net|nt)\s*\.?\s*(?:profit|earnings)\s*\.?\s*(\d+\.?\d*)\.?\s*(lakh|crore|million)',s)
[('23.5', 'million')]

edited May 15, 2017 at 7:14

answered May 15, 2017 at 7:02

akash karothiya

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