Regex: Is it possible to use "|" for only part of match pattern?

Question

Is it possible to do something like the following:

re.match(r'someArbLongRegex{option1|option2}anotherArbLongRegex', line)

as opposed to having to do:

re.match(r'someArbLongRegexoption1anotherArbLongRegex|someArbLongRegexoption2anotherArbLongRegex', line)

Basically instead of | applying to the whole regex pattern I just want it to apply to one small part of the regex pattern.

Answer 1

尝试使用 (?:option1|option2)

re.match(r'someArbLongRegex(?:option1|option2)anotherArbLongRegex', line)

Answer 2

Yes. Just use parenthesis.

re.match(r'someArbLongRegex((option1)|(option2))anotherArbLongRegex', line)

Sometimes, depending on the data, you know that option1 and option2 won't both be in 'line', and at least 1 of them will. Then you can just do this:

re.match(r'(someArbLongRegex)((option1)?(option2)?)anotherArbLongRegex', line)