Creating a match with regex in Python

Question

I am currently using a regex to match a certain line such as:

(.0025 = 625 dollars per contract)

I have a regex which I used for a similar expression, that gets the job done. But, I wanted to know if there was a better implementation for it:

new_string = re.search(r'.*?\([^$]*?([\$|\d][^)]* per contract)\)', cell)

I know I can change point where it looks for a dollar sign, but any other things?

If you could also explain your regex, it would be helpful.

If you want some (useful) help, you must explain with precision what you are looking for. example: is the word "dollars" always present, what is your final goal, what do you want to extract exactly. — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Jul 25, 2013 at 2:40

llb · Accepted Answer · 2013-07-25 03:38:58Z

1

If you always want to gather the price, you can do this:

regex_string = r'= (.*? per contract)'

This catches:

'625 dollars per contract'

All it does is take anything between the equal sign (and space after it) and the words "per contract." Since your regex assumes that the words "per contract" will always be present, so does mine.

If you just want the price, you can do this instead:

>>>regex_string = r'= (.*?) per contract'
>>>matchobj = re.search(regex_string, "(.0025 = 625 dollars per contract)")
>>>matchobj.groups()
('625 dollars',)

answered Jul 25, 2013 at 3:38

llb

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