Java String regular expression on string array to capture nested data

Question

[
Dobj(id=null, dmetaD=DmetaD(id=2068, embedded=true, size=123, comment=raghu, name=string, type=pdf)),dcont=DConD(data=abc)),
Dobj(id=null, dmetaD=DmetaD(id=2069, embedded=true, size=123, comment=raghu, name=string, type=pdf)),dcont=DConD(data=abc))
]

As you can see in the above object array i want to split and retrieve all the objects starting with the name DmetaD and DConD as string .

example:

String x=DmetaD(id=2068, embedded=true, size=123, comment=raghu, name=string, type=pdf))

String y=DConD(data=abc)

Can you tell us more about the source of this data? Wouldn't it be easier to extract data from the original Java objects themselves? — Tim Biegeleisen
– Tim Biegeleisen, Commented May 15, 2018 at 14:24
This is transported as a string from producer to subscriber in queue which is basically a list converted to string. — Prash
– Prash, Commented May 15, 2018 at 14:27
Well I would vote for converting back into a list on the other end and then using normal Java to extract the information you want. — Tim Biegeleisen
– Tim Biegeleisen, Commented May 15, 2018 at 14:30

Youcef LAIDANI · Accepted Answer · 2018-05-15 14:38:36Z

1

You can use Pattern & Matcher with this regex (DmetaD\\(.*?\\)|DConD\\(.*?\\)) for example If you are using Java 9+ :

String input = "...";
String regex = "(DmetaD\\(.*?\\)|DConD\\(.*?\\))";
List<String> result = Pattern.compile(regex)
        .matcher(input)
        .results()
        .map(MatchResult::group)
        .collect(Collectors.toList());

Output

DmetaD(id=2068, embedded=true, size=123, comment=raghu, name=string, type=pdf)
DConD(data=abc)
DmetaD(id=2069, embedded=true, size=123, comment=raghu, name=string, type=pdf)
DConD(data=abc)

Before Java 9 you can use :

Matcher matcher = Pattern.compile(regex).matcher(input);

List<String> result = new ArrayList<>();
while (matcher.find()) {
    result.add(matcher.group());
}

Details about the regex (DmetaD\(.*?\)|DConD\(.*?\))

DmetaD\(.*?\) a matches which start with DmetaD followed by any thing between parenthesis.
| or
DConD\(.*?\) a matches which start with DConD followed by any thing between parenthesis.

edited May 15, 2018 at 14:38

answered May 15, 2018 at 14:29

Youcef LAIDANI

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4 Comments

Prash Over a year ago

Just getting a compilation error The method results() is undefined for the type Matcher

Youcef LAIDANI Over a year ago

It seems you are not using Java 9+ try the second solution @Prash

Prash Over a year ago

,please take a look at this json and can you please help me to get dmetaD and dCont. github.com/javayp/stream-zipkin/blob/master/client-appd.json

Youcef LAIDANI Over a year ago

@Prash I strongly suggest to use a JSon parser instead of regex, there are many ways to parse a JSon

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