eclipse - Listening for a particular keyword from a particular number in Android -

i need know of way make application listen particular keyword (an ip address) particular number.

i found great ip matching regex

validipaddressregex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$";