regex - How to parse a command line with regular expressions?

Question

I want to split a command line like string in single string parameters. How look the regular expression for it. The problem are that the parameters can be quoted. For example like:

"param 1" param2 "param 3"

should result in:

param 1, param2, param 3

Answer 1

You should not use regular expressions for this. Write a parser instead, or use one provided by your language.

I don't see why I get downvoted for this. This is how it could be done in Python:

>>> import shlex
>>> shlex.split('"param 1" param2 "param 3"')
['param 1', 'param2', 'param 3']
>>> shlex.split('"param 1" param2 "param 3')
Traceback (most recent call last):
    [...]
ValueError: No closing quotation
>>> shlex.split('"param 1" param2 "param 3""')
['param 1', 'param2', 'param 3"']

Now tell me that wrecking your brain about how a regex will solve this problem is ever worth the hassle.