int i; i = 34564856; 
(int)( )(i)(;)( )(i)( )(=)( )(34564856)(;) 
[(int)(i)(;)][(i)(=)(34564856)(;)] 

    1. maximal munch
    2. első





1+2*3
(1+(2*3))


int i; i = 3; 

i = 3; 


a
kk
k|k
k*


k+   ===   kk*
k?   ===   (k|)

0|1|2|.......
[0123456789]
[^0123456789]
[0-9]
.
[ ]
" "
"hthg hts hdgp gps"
\"
\\
\ 
\n
\t


szam        [0-9]*
szamV2      [0-9]+
szamV3      0|[1-9][0-9]*
            0|[1-9]{szam}
            [0-9]|[1-9]{szam}
            [0-9]|[1-9]+{szam}
eszam       [+-]?{szamV3}
tort        {eszam}[.]{szam}
    12.34
    .645
    1245.
    3412.24e5

azon        [a-zA-Z][a-zA-Z0-9_]*
ws          [ \t\n]*
            [ \t\n]+
comment     \/\/.*\n
            \/\/.*


"ethhbviei"
"""
/* */   */