Java regex split string by comma but ignore quotes and also parentheses [duplicate]

Question

I'm stuck with this regex.

So, I have input as:

• "Crane device, (physical object)"(X1,x2,x4), not "Seen by research nurse (finding)", EntirePatellaBodyStructure(X1,X8), "Besnoitia wallacei (organism)", "Catatropis (organism)"(X1,x2,x4), not IntracerebralRouteQualifierValue, "Diospyros virginiana (organism)"(X1,x2,x4), not SuturingOfHandProcedure(X1)

and in the end I would like to get is:

• "Crane device, (physical object)"(X1,x2,x4)
• not "Seen by research nurse (finding)"
• EntirePatellaBodyStructure(X1,X8)
• "Besnoitia wallacei (organism)"
• "Catatropis (organism)"(X1,x2,x4)
• not IntracerebralRouteQualifierValue
• "Diospyros virginiana (organism)"(X1,x2,x4)
• not SuturingOfHandProcedure(X1)

I've tried regex

(\'[^\']*\')|(\"[^\"]*\")|([^,]+)|\\s*,\\s*

It works if I don't have a comma inside parentheses.

Answer 1

RegEx

(\w+\s)?("[^"]+"|\w+)(\(\w\d(,\w\d)*\))?

Java Code

String input = ... ;
Matcher m = Pattern.compile(
          "(\\w+\\s)?(\"[^\"]+\"|\\w+)(\\(\\w\\d(,\\w\\d)*\\))?").matcher(input);
while(matcher.find()) {
    System.out.println(matcher.group());
}

Output

"Crane device, (physical object)"(X1,x2,x4)
not "Seen by research nurse (finding)"
EntirePatellaBodyStructure(X1,X8)
not "Besnoitia wallacei (organism)"(X1,x2,x4)
not "Catatropis (organism)"(X1,x2,x4)
not IntracerebralRouteQualifierValue
not "Diospyros virginiana (organism)"(X1,x2,x4)
not SuturingOfHandProcedure(X1)

Answer 2

Don't use regexes for this. Write a simple parser that keeps track of the number of parentheses encountered, and whether or not you are inside quotes. For more information, see: RegEx match open tags except XHTML self-contained tags