How do the regular expression capture infinite groups?

问题

I need to match the following:

text[ - (option1 option2 .. optionN)]

• text may or may not have spaces
• - is literal and will only appear if there are any option
• can have infinite options

Examples:

rabbit
rabbit white
rabbit - onlyGif
rabbie - onlyGif recent

Currently, I got the following, which works:

^([\w ]+)(?:$|\s-\s(\w+)(?:\s(\w+))?(?:\s(\w+))?)

However, capture at least 3 options, and I need to capture N options. How to do this?

I'm using Python.

回答1:

There is no way to have an unbounded number of capturing groups in Python regexes. However, you can use one regex to match the entire expression and then use a second regex to parse the options. For example:

match = re.match(r'^([\w ]+)(?:\s-((?:\s\w+)+))?$', input)
if match:
    text = match.group(1)
    if match.group(2):
        options = [m.group(0) for m in re.finditer(r'\w+', match.group(2))]
    else:
        options = []

来源：https://stackoverflow.com/questions/27698616/how-do-the-regular-expression-capture-infinite-groups