How to split some of the minus operators based on a condition?-CodePudding

I was working of a mathematical formula ,I need to split operands for the processing,

I was using re.split('\ |\-|\*|\/', Formula) function in python to split the formula into operands.

But I have one notation wa(A,[-126,5-123,-120,-117,-114,-111,-108,-105,-102,-99,-96,-93,-90,-87,-84,-81,-78])-B-C-D which I couldn't split using the above regex as its splits the number in the list too(its taking - before 126 also for spliting)

Is there any way we can using regex and split into [wa(A,[-126,-123,-120,-117,-114,-111,-108,-105,-102,-99,-96,-93,-90,-87,-84,-81,-78]),B,C,D] , or I need to loop through the expression and write the logic?

CodePudding user response：

You might use an alternation to match either word characters followed by an opening till closing parenthesis, or match any char except a hyphen.

\w \([^()] \)|[^\s /*-]

See a regex demo and a Python demo.

import re

pattern = r"\w \([^()] \)|[^\s /*-] "
s = "wa(A,[-126,5-123,-120,-117,-114,-111,-108,-105,-102,-99,-96,-93,-90,-87,-84,-81,-78])-B-C-D"

print(re.findall(pattern, s))

Output

['wa(A,[-126,5-123,-120,-117,-114,-111,-108,-105,-102,-99,-96,-93,-90,-87,-84,-81,-78])', 'B', 'C', 'D']