Java split string on comma(,) except when between

问题:

This question already has answers here:

Regex to match only commas not in parentheses? (3 answers)

Closed 4 years ago.

I would like to split a string in java on a comma(,) but whenever the comma(,) is in between some parenthesis, it should not be split.

e.g. The string :

"life, would, (last , if ), all"

Should yield:

-life
-would
-(last , if )
-all

When I use :

String text = "life, would, (last , if ), all"
text.split(",");

I end up dividing the whole text even the (last , if ) I can see that split takes a regex but I can't seem to think of how to make it do the job.

回答1:

you could use this pattern - (not for nested parenthesis)

,(?![^()]*\))

Demo

,               # ","
(?!             # Negative Look-Ahead
  [^()]         # Character not in [()] Character Class
  *             # (zero or more)(greedy)
  \             # 
)               # End of Negative Look-Ahead
)