php - How to make a regex to recognise a specific pattern of words -

i'm poor in regex, reason left no choice use it.

i'm trying extract list of "port number" , respective "ip address" webpage's table. , because dynamic webpage using ajax , php stuff generate dynamic content, table elements doesn't have id or class or unique things. had eliminates /t, /r , /n using str_replace, whole content contains words , spaces.

here example of port , ip addr:

port - fa0/0, gi1/0/2.100, ethernet01, gigaether-01 (contains upper , lower case, dot, dash, slash , numbers, , shouldn't more 16 characters, no spaces)

ip adrr - 123.123.123.123, 1.1.12.12, 123.12.1.1 (no difference common ip addr)

but fortunately, "port" , "ip address" followed either port image or ip image., like

...<img border='0' src='images/port.png' width='18' heigh='18'>fa0/0</td>... or ...<img border='0' src='images/ip.png' width='18' heigh='18'>1.1.1.1</td>... 

i believe there no spaces between port/ip , img/td tag. i'm able use pattern extracting them, used following patterns:

port -

$pattern = "/<img border\='0' src='images\/port\.png' width\='18' height\='18'>([a-za-z0-9\/ _-]{1,15})<\/td>/"; 

ip addr -

$pattern = "<img border\='0' src\='images\/ip\.png' width\='18' height\='18'>\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b <\/td>/"; 

and followed preg_match_all($pattern, $content, $matches); . . .

but both of them return nothing me, tried following patterns:

port -

$pattern = "/<img border\='0' src='images\/port\.png' width\='18' height\='18'>(.*)<\/td>/"; 

ip addr -

$pattern = "<img border\='0' src\='images\/ip\.png' width\='18' height\='18'>(.*)<\/td>/"; 

...

but these pattern return like

<img border\='0' src='images\/port\.png' width\='18' height\='18'>fa0/0 <\/td>....(followed bunch of unwanted text , code) ......<\/td> 

because (.*) consider anyting between <img....> , </td> valid match

and also, tried specific ip address regex,$pattern = "/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/";

it return ip addresses me (like 111.22.3.119), unfortunately of link url in webpage contains ip address not want.

then tried $pattern = "/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}<\/td>\b/";, returns nothing...

appreciate ppl willing me on this, thanks.

* edit 1 *

i tried $pattern = "/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b<\/td>/";, works, don't know why, still figuring how solve port regex....

$pattern1 = '#<img[^>]+>([a-z][\w./-]{1,16})</td>#i'; $pattern2 = '#<img[^>]+>([\d]{1,3}\.[\d]{1,3}\.[\d]{1,3}\.[\d]{1,3})</td>#';