String split token=value in java and regex

Question

I have this string

token1=value1Token2=value2Token3[12]=value3

where tokenX might be a string with numbers (e.g.: myToken12 or my2Token) and valueX just numbers or symbols (e.g.: 123123 or {{1, 2}, 3, 4})

that I'd like to transform into this array:

['token1=value1', 'token2=value2', 'token3[12]=value3']

example of string I might have:

String s = na23me=12341234las4tName={{0,0,0},{0,0,0},{0,0,0}}stree2t[696]=764545457OK

I tried with split and matcher ...

this question has been already posted but this is different as it is more general (token=value) where value in the previous question was just a number or in a different post symbols. I'd like to have a general answer here.

thanks.

MORE DETAIL:

with this string:

String s = na23me=12341234las4tName=654567stree2t[696]=764545457OK

this solution:

String[] tokens = s.split("(?<==\\d{1,1000})(?=[a-zA-Z])");

works, but I might have as "value" something like this {1, 2, 3} that I'd like to consider. that's why is different.

ONE LEVEL MORE what about if I want to include the "TEST" too?

e.g.:

conf=0ticket[0,9]="TEST"config={0,0,0}platform_id=121212

I've tried with this

String[] tokens = buffer.split("(?<==\\d{1,1000}|\\W| **\"\\w\"**)(?=[a-zA-Z])");

EXPECTED:

At the end just managing the "STRING" as "value", but it shouldn't be a big issue as is into the double quote.


['conf=0', 'ticket[0,9]="TEST"', 'config={0,0,0}', 'platform_id=121212']

doesn't work ..idea?

Show what you have tried already and tell us where it failed. — Paco Abato
– Paco Abato, Commented Dec 12, 2014 at 14:52
because valueX could be just numbers and symbols (e.g.: {) NOT char — Kasper
– Kasper, Commented Dec 12, 2014 at 15:07
So an example input is: token1=111Token2=222Token3[12]=33my2Token=444? — anubhava
– anubhava, Commented Dec 12, 2014 at 15:11
@Kasper In your example from few coments earlier token1={{0, 0, 1}, 2, 2}Token2={{0, 0, 1}, 2, 2} Token3[12]={{0, 0, 1}, 2, 2}my2Token={{0, 0, 1}, 2, 2} you have space between {{0, 0, 1}, 2, 2} Token3 but in your description from question I don't see any spaces between value1Token2. So which is wrong, description of your data or example? — Pshemo
– Pshemo, Commented Dec 12, 2014 at 16:00

anubhava · Accepted Answer · 2014-12-12 17:25:59Z

Looks like your input string is getting more and more complex. Here is one regex that seems to be working for all of your provided inputs:

void getTokens(String s) {
   String[] toks = s.split( "(?<==(?>\"[^\"=]{1,1000}\"|\\P{L}{1,1000})) *(?=\\p{L})" );
   for (String tok: toks)
      System.out.printf("=> <%s>%n", tok);
}

Testing:

getTokens("conf=0ticket[0,9]=\"TEST\"config={0,0,0}platform_id=121212");
=> <conf=0>
=> <ticket[0,9]="TEST">
=> <config={0,0,0}>
=> <platform_id=121212>

getTokens("na23me=12341234las4tName={{0,0,0},{0,0,0},{0,0,0}}stree2t[696]=764545457OK");
=> <na23me=12341234>
=> <las4tName={{0,0,0},{0,0,0},{0,0,0}}>
=> <stree2t[696]=764545457>
=> <OK>

getTokens("na23me=12341234las4tName=654567stree2t[696]=764545457OK");
=> <na23me=12341234>
=> <las4tName=654567>
=> <stree2t[696]=764545457>
=> <OK>

Explanation:

Regex uses a lookbehind and a lookahead for splitting:

(?<==(?>\"[^\"=]{1,1000}\"|\\P{L}{1,1000})) is a positive lookbehind that makes sure current position is preceded by a = followed by one of these:
- A double quoted string of max 1000 in length OR
- 1 to 1000 non unicode letters
(?>foo|bar) is called an Atomic Group
(?=\\p{L}) is a positive lookahead that makes sure there is a unicode letter following current position

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