-- build & install
~$ ./configure && make && make install ( install dir is [configure_dir]/install )
-- usage
~$ ./ped -h ..or.. ./ped -H ~$ echo 12abc34 | ./ped -re 'ID <- [a-zA-Z_] [a-zA-Z0-9]* {_0 = "@" _0 "@" }' #>> 12@abc@34