regex - I'm looking to extract values from matched pattern in Java -

i'm using regex:

([\w\s]+)(=|!=)([\w\s]+)( (or|and) ([\w\s]+)(=|!=)([\w\s]+))*

to match string such this: i= 2 or =3 , k!=4

when try extract values using m.group(index), get: (i, =, 2, **and k!=4**, and, k, ,!=, 4).

expected output: (i, =, 2, or, i, =, 3, and, k , !=, 4) how extract values correctly?

p.s. m.matches() returns true.

you trying match regexp on expression...you might want use parser, because regexp (when have it) can't extended further..but parser can extended @ time

for example, consider using antlr (antlr: there simple example?)