CODEWITHSUNDEEP
javaregex
Geesh_SO
Geesh_SO

Reputation: 2206

Parsing String with Regex in Java

I have a String which is formatted as such

[dgdds,dfse][fsefsf,sefs][fsfs,fsef]

How would I use Regex to quickly parse this to return an ArrayList with each value containing one "entry" as such?

ArrayList <String>:

0(String): [dgdds,dfse]

1(String): [fsefsf,sefs]

2(String): [fsfs,fsef]

Really stuck with this, any help would be great.

Upvotes: 0

Views: 262

Answers (7)

user557597
user557597

Reputation:

Split using this (?:(?<=\])|^)(?=\[) might work if there are nothing between ][

Upvotes: 1

Dragos
Dragos

Reputation: 1040

You should try this regex :
Pattern pattern = Pattern.compile("\\[\\w*,\\w*\\]");

Upvotes: 3

Adam Stelmaszczyk
Adam Stelmaszczyk

Reputation: 19837

You can use simple \[.*?\] regex, which means: match a string starting with [, later zero or more characters (but as short as possible, not greedly, that's why the ? in .*?), ending with ].

This works, you can test it on Ideone:

List<String> result = new ArrayList<String>();
String input = "[dgdds,dfse][fsefsf,sefs][fsfs,fsef]";
Pattern pattern = Pattern.compile("\\[.*?\\]");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) 
{
    result.add(matcher.group());
}
System.out.println(result);

Output:

[[dgdds,dfse], [fsefsf,sefs], [fsfs,fsef]]

Upvotes: 1

Pshemo
Pshemo

Reputation: 124215

How about 

String myData = "[dgdds,dfse][fsefsf,sefs][fsfs,fsef]";
List<String> list = new ArrayList<>(Arrays.asList(myData
        .split("(?<=\\])")));

for (String s : list)
    System.out.println(s);

Output:

[dgdds,dfse]
[fsefsf,sefs]
[fsfs,fsef]

This regex will use look behind mechanism to split on each place after ].

Upvotes: 3

Sage
Sage

Reputation: 15408

We can use split(regex) function directly by escaping "]": "\\]" and then use it as the regex for pattern matching:

String str = "[dgdds,dfse][fsefsf,sefs][fsfs,fsef]";
     String bal[] = str.split("\\]");

     ArrayList<String>finalList = new ArrayList<>();

     for(String s:bal)
     {
         finalList.add(s+"]");
     }
     System.out.println(finalList);

Upvotes: 1

Iulian Rosca
Iulian Rosca

Reputation: 1015

Old, easy, awesome way :) 

String s = "[dgdds,dfse][fsefsf,sefs][fsfs,fsef]";
        String[] token = s.split("]");
        for (String string : token) {
            System.out.println(string + "]");
        }

Upvotes: 2

Josh T
Josh T

Reputation: 564

You may need to do it in two passes:

(1) Split out by the brackets if it's just a 1D array (not clear in the question):

String s = "[dgdds,dfse][fsefsf,sefs][fsfs,fsef]";
String[] sArray = s.split("\\[|\\]\\[|\\]");

(2) Split by the commas if you want to also divide, say "dgdds,dfse"

sArray[i].split(",");

Upvotes: 1

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