Question

I have many strings referring to monetary values, such as $15K, USD20M, €1.8k , etc
Now I need to extract the number and the multiplier (K,k, M or m) in order to process the data.

I came up with the following regex:

[\${1}|€{1}][0-9]+(?:\.[0-9]*)?[M|K|k|m]

But I’m not sure how to extract each of the subparts of the expression and return them back to my Python code as variables, so for $15K, I would want:

currency='$'
ammount=15
multiplier='K'

Any ideas?

Answer 1

Like this?

In [1]: import re 

In [2]: re.match(r'(?P<currency>\D+)(?P<amount>\d+(\.\d+)?)(?P<multiplier>[mMkK])', '$15k').groupdict()
Out[2]: {'amount': '15', 'currency': '$', 'multiplier': 'k'}

Not like it’s really necessary in Python, though, when you can just do

currency, amount, _, multiplier =  re.match(r'(\D+)(\d+(\.\d+)?)([mMkK])', '$1.5k').groups()

or even simpler

currency, amount, multiplier = re.match(r'(\D+)(\d+(?:\.\d+)?)([mMkK])', '$1.5k').groups()