Python regex for getting string with special characters

Question

So i want to get specific data

So string is an input by the user

"price_to_earning + current_price * 0.8"

It could even be

"price_to_earning*current_price+0.8"

or

"price_to_earning *current_price/0.8"

How can i extract just "price_to_earning" & "current_price" from the above

currently, I'm using

    words = re.findall(r"\b\S+", raw_query)

but it gets

['price_to_earning', 'current_price', '0.8']

what I want is

['price_to_earning', 'current_price']

Using regex to parse mathematical expressions is misdirected. You want to cope with arbitrary nesting of parentheses; use a proper parser instead. This is a common FAQ. — tripleee
– tripleee, Commented Jul 12, 2022 at 8:35

Droid · Accepted Answer · 2022-07-12 07:49:10Z

1

Why not use a regex to match words without digits, e.g. [^\d\W]+ ?

have a look at the demo here https://regex101.com/r/EbNQvm/1

answered Jul 12, 2022 at 7:49

Droid

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Mortz · Accepted Answer · 2022-07-12 08:02:51Z

1

You can specify the characters you want to exclude, and replace everything else with a space, for example -

s1 = "price_to_earning + current_price * 0.8"
s2 = "price_to_earning*current_price+0.8"
s3 = "price_to_earning *current_price/0.8"
for s in [s1, s2, s3]:
    print(re.sub(r'[^a-zA-Z_]', ' ', s).split())

Output

['price_to_earning', 'current_price']
['price_to_earning', 'current_price']
['price_to_earning', 'current_price']

answered Jul 12, 2022 at 8:02

Mortz

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Comments

Shamim · Accepted Answer · 2022-07-12 08:33:36Z

0

You can try finding only characters and _

words = re.findall(r"[a-zA-Z_]+", raw_query)

edited Jul 12, 2022 at 8:33

answered Jul 12, 2022 at 8:32

Shamim

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