Question

I am new to Python and I do not know regular expressions in Python. Here is the question. I have a sentence like “Total Cost: 37” in stdout, I want to extract the cost info which is 37. When I match the words “Total Cost: ” in a specific line how should I get the rest of the line which is the info that I am interested in?

Answer 1

use regex:

Total Cost:\s? explanation:

“Total Cost”: Match the literal Total Cost:

\s? : 1 to 0 times Whitespace [\t \r\n\f]

Capturing group ([-+]?\d+):

[-+]?: 1 to 0 times matches one of the following chars: -+

\d+ :infinite to 1 times Digit [0-9]

In [121]: strs="some text Total Cost: 37 some more more Total Cost: -100"

In [122]: re.findall(r"Total Cost:\s?([-+]?\d+)",strs)
Out[122]: ['37', '-100']